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<hr/>
<center>Math 107</center>
<center>Sample Mini Test #6</center>
<br/>

<div class="Section1">

<p class="MsoNormal">1. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mn>3</m:mn><m:mi>x</m:mi>
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaaiaaiodacaWG4baaaaaa@3AC3@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">Put <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>u</m:mi><m:mo>=</m:mo><m:mn>3</m:mn><m:mi>x</m:mi>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2da9iaaiodacaWG4baaaa@39A8@</m:annotation>
 </m:semantics>
</m:math>,
then <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaaiaadwhaaaaaaa@3A03@</m:annotation>
 </m:semantics>
</m:math>.
</p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaamizaiaadMhaaeaacaWGKbGaamyDaaaadaWcaaqaaiaadsgacaWG1baabaGaamizaiaadIhaaaaaaa@4284@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   <m:mo stretchy='false'>(</m:mo><m:mn>3</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaamyDaaaakiaacIcacaaIZaGaaiykaaaa@3A1F@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mn>3</m:mn><m:mi>x</m:mi>
    </m:mrow>
   </m:msup>
   <m:mo stretchy='false'>(</m:mo><m:mn>3</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaaG4maiaadIhaaaGccaGGOaGaaG4maiaacMcaaaa@3ADF@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mn>3</m:mn><m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mn>3</m:mn><m:mi>x</m:mi>
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaG4maiaadwgadaahaaWcbeqaaiaaiodacaWG4baaaaaa@397C@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">2. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:msup>
      <m:mi>x</m:mi>
      <m:mn>2</m:mn>
     </m:msup>
     <m:mo>+</m:mo><m:mn>4</m:mn><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>5</m:mn>
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaaiabgkHiTiaaiodacaWG4bWaaWbaaWqabeaacaaIYaaaaSGaey4kaSIaaGinaiaadIhacqGHsislcaaI1aaaaaaa@40EE@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">Put <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>u</m:mi><m:mo>=</m:mo><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:msup>
    <m:mi>x</m:mi>
    <m:mn>2</m:mn>
   </m:msup>
   <m:mo>+</m:mo><m:mn>4</m:mn><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>5</m:mn>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2da9iabgkHiTiaaiodacaWG4bWaaWbaaSqabeaacaaIYaaaaOGaey4kaSIaaGinaiaadIhacqGHsislcaaI1aaaaa@3FD1@</m:annotation>
 </m:semantics>
</m:math>,
then <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaaiaadwhaaaaaaa@3A03@</m:annotation>
 </m:semantics>
</m:math>.</p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaamizaiaadMhaaeaacaWGKbGaamyDaaaadaWcaaqaaiaadsgacaWG1baabaGaamizaiaadIhaaaaaaa@4284@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   <m:mo stretchy='false'>(</m:mo><m:mo>&#x2212;</m:mo><m:mn>6</m:mn><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>4</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaamyDaaaakiaacIcacqGHsislcaaI2aGaamiEaiabgUcaRiaaisdacaGGPaaaaa@3DAC@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal"> = <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:msup>
      <m:mi>x</m:mi>
      <m:mn>2</m:mn>
     </m:msup>
     <m:mo>+</m:mo><m:mn>4</m:mn><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>5</m:mn>
    </m:mrow>
   </m:msup>
   <m:mo stretchy='false'>(</m:mo><m:mo>&#x2212;</m:mo><m:mn>6</m:mn><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>4</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaeyOeI0IaaG4maiaadIhadaahaaadbeqaaiaaikdaaaWccqGHRaWkcaaI0aGaamiEaiabgkHiTiaaiwdaaaGccaGGOaGaeyOeI0IaaGOnaiaadIhacqGHRaWkcaaI0aGaaiykaaaa@4497@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mn>2</m:mn><m:mo stretchy='false'>(</m:mo><m:mn>2</m:mn><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:mi>x</m:mi><m:mo stretchy='false'>)</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:msup>
      <m:mi>x</m:mi>
      <m:mn>2</m:mn>
     </m:msup>
     <m:mo>+</m:mo><m:mn>4</m:mn><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>5</m:mn>
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaGOmaiaacIcacaaIYaGaeyOeI0IaaG4maiaadIhacaGGPaGaamyzamaaCaaaleqabaGaeyOeI0IaaG4maiaadIhadaahaaadbeqaaiaaikdaaaWccqGHRaWkcaaI0aGaamiEaiabgkHiTiaaiwdaaaaaaa@4462@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">3. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mfrac>
      <m:mn>1</m:mn>
      <m:mi>x</m:mi>
     </m:mfrac>
     
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaamaalaaabaGaaGymaaqaaiaadIhaaaaaaaaa@3AD1@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">Put <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>u</m:mi><m:mo>=</m:mo><m:mfrac>
    <m:mn>1</m:mn>
    <m:mi>x</m:mi>
   </m:mfrac>
   <m:mo>=</m:mo><m:msup>
    <m:mi>x</m:mi>
    <m:mrow>
     <m:mo>&#x2212;</m:mo><m:mn>1</m:mn>
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2da9maalaaabaGaaGymaaqaaiaadIhaaaGaeyypa0JaamiEamaaCaaaleqabaGaeyOeI0IaaGymaaaaaaa@3D8E@</m:annotation>
 </m:semantics>
</m:math>,
then <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaaiaadwhaaaaaaa@3A03@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaamizaiaadMhaaeaacaWGKbGaamyDaaaadaWcaaqaaiaadsgacaWG1baabaGaamizaiaadIhaaaaaaa@4284@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   <m:mo stretchy='false'>(</m:mo><m:mo>&#x2212;</m:mo><m:msup>
    <m:mi>x</m:mi>
    <m:mrow>
     <m:mo>&#x2212;</m:mo><m:mn>2</m:mn>
    </m:mrow>
   </m:msup>
   <m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaamyDaaaakiaacIcacqGHsislcaWG4bWaaWbaaSqabeaacqGHsislcaaIYaaaaOGaaiykaaaa@3D2C@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mfrac>
      <m:mn>1</m:mn>
      <m:mi>x</m:mi>
     </m:mfrac>
     
    </m:mrow>
   </m:msup>
   <m:mo stretchy='false'>(</m:mo><m:mo>&#x2212;</m:mo><m:msup>
    <m:mi>x</m:mi>
    <m:mrow>
     <m:mo>&#x2212;</m:mo><m:mn>2</m:mn>
    </m:mrow>
   </m:msup>
   <m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaWaaSaaaeaacaaIXaaabaGaamiEaaaaaaGccaGGOaGaeyOeI0IaamiEamaaCaaaleqabaGaeyOeI0IaaGOmaaaakiaacMcaaaa@3DFA@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mo>&#x2212;</m:mo><m:mfrac>
    <m:mn>1</m:mn>
    <m:mrow>
     <m:msup>
      <m:mi>x</m:mi>
      <m:mn>2</m:mn>
     </m:msup>
     
    </m:mrow>
   </m:mfrac>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mfrac>
      <m:mn>1</m:mn>
      <m:mi>x</m:mi>
     </m:mfrac>
     
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeyOeI0YaaSaaaeaacaaIXaaabaGaamiEamaaCaaaleqabaGaaGOmaaaaaaGccaWGLbWaaWbaaSqabeaadaWcaaqaaiaaigdaaeaacaWG4baaaaaaaaa@3C75@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">4. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mfrac>
      <m:mrow>
       <m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn>
      </m:mrow>
      <m:mrow>
       <m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn>
      </m:mrow>
     </m:mfrac>
     
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaamaalaaabaGaamiEaiabgUcaRiaaikdaaeaacaWG4bGaeyOeI0IaaG4maaaaaaaaaa@3E5B@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">Put <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>u</m:mi><m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn>
    </m:mrow>
    <m:mrow>
     <m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2da9maalaaabaGaamiEaiabgUcaRiaaikdaaeaacaWG4bGaeyOeI0IaaG4maaaaaaa@3D40@</m:annotation>
 </m:semantics>
</m:math>,
then <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadwgadaahaaWcbeqaaiaadwhaaaaaaa@3A03@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaamizaiaadMhaaeaacaWGKbGaamyDaaaadaWcaaqaaiaadsgacaWG1baabaGaamizaiaadIhaaaaaaa@4284@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   <m:mrow><m:mo>[</m:mo> <m:mrow>
    <m:mfrac>
     <m:mrow>
      <m:mo stretchy='false'>(</m:mo><m:mn>1</m:mn><m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:mo stretchy='false'>)</m:mo><m:mo>&#x2212;</m:mo><m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn><m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:mn>1</m:mn><m:mo stretchy='false'>)</m:mo>
     </m:mrow>
     <m:mrow>
      <m:msup>
       <m:mrow>
        <m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:mo stretchy='false'>)</m:mo>
       </m:mrow>
       <m:mn>2</m:mn>
      </m:msup>
      
     </m:mrow>
    </m:mfrac>
    
   </m:mrow> <m:mo>]</m:mo></m:mrow>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaamyDaaaakmaadmaabaWaaSaaaeaacaGGOaGaaGymaiaacMcacaGGOaGaamiEaiabgkHiTiaaiodacaGGPaGaeyOeI0IaaiikaiaadIhacqGHRaWkcaaIYaGaaiykaiaacIcacaaIXaGaaiykaaqaaiaacIcacaWG4bGaeyOeI0IaaG4maiaacMcadaahaaWcbeqaaiaaikdaaaaaaaGccaGLBbGaayzxaaaaaa@4C07@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   <m:mrow><m:mo>[</m:mo> <m:mrow>
    <m:mfrac>
     <m:mrow>
      <m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:mo>&#x2212;</m:mo><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>2</m:mn>
     </m:mrow>
     <m:mrow>
      <m:msup>
       <m:mrow>
        <m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:mo stretchy='false'>)</m:mo>
       </m:mrow>
       <m:mn>2</m:mn>
      </m:msup>
      
     </m:mrow>
    </m:mfrac>
    
   </m:mrow> <m:mo>]</m:mo></m:mrow>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaamyDaaaakmaadmaabaWaaSaaaeaacaWG4bGaeyOeI0IaaG4maiabgkHiTiaadIhacqGHsislcaaIYaaabaGaaiikaiaadIhacqGHsislcaaIZaGaaiykamaaCaaaleqabaGaaGOmaaaaaaaakiaawUfacaGLDbaaaaa@4538@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mi>u</m:mi>
   </m:msup>
   <m:mrow><m:mo>[</m:mo> <m:mrow>
    <m:mfrac>
     <m:mrow>
      <m:mo>&#x2212;</m:mo><m:mn>5</m:mn>
     </m:mrow>
     <m:mrow>
      <m:msup>
       <m:mrow>
        <m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:mo stretchy='false'>)</m:mo>
       </m:mrow>
       <m:mn>2</m:mn>
      </m:msup>
      
     </m:mrow>
    </m:mfrac>
    
   </m:mrow> <m:mo>]</m:mo></m:mrow>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaamyDaaaakmaadmaabaWaaSaaaeaacqGHsislcaaI1aaabaGaaiikaiaadIhacqGHsislcaaIZaGaaiykamaaCaaaleqabaGaaGOmaaaaaaaakiaawUfacaGLDbaaaaa@40AA@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mo>&#x2212;</m:mo><m:mn>5</m:mn>
    </m:mrow>
    <m:mrow>
     <m:msup>
      <m:mrow>
       <m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn><m:mo stretchy='false'>)</m:mo>
      </m:mrow>
      <m:mn>2</m:mn>
     </m:msup>
     
    </m:mrow>
   </m:mfrac>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mrow>
     <m:mfrac>
      <m:mrow>
       <m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn>
      </m:mrow>
      <m:mrow>
       <m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>3</m:mn>
      </m:mrow>
     </m:mfrac>
     
    </m:mrow>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacqGHsislcaaI1aaabaGaaiikaiaadIhacqGHsislcaaIZaGaaiykamaaCaaaleqabaGaaGOmaaaaaaGccaWGLbWaaWbaaSqabeaadaWcaaqaaiaadIhacqGHRaWkcaaIYaaabaGaamiEaiabgkHiTiaaiodaaaaaaaaa@4306@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">5. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>x</m:mi><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   <m:mo>&#x2212;</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadIhacaWGLbWaaWbaaSqabeaacaWG4baaaOGaeyOeI0IaamyzamaaCaaaleqabaGaamiEaaaaaaa@3E0E@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mo stretchy='false'>[</m:mo><m:mo stretchy='false'>(</m:mo><m:mn>1</m:mn><m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   <m:mo stretchy='false'>)</m:mo><m:mo>+</m:mo><m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   <m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>]</m:mo><m:mo>&#x2212;</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9iaacUfacaGGOaGaaGymaiaacMcacaGGOaGaamyzamaaCaaaleqabaGaamiEaaaakiaacMcacqGHRaWkcaGGOaGaamiEaiaacMcacaGGOaGaamyzamaaCaaaleqabaGaamiEaaaakiaacMcacaGGDbGaeyOeI0IaamyzamaaCaaaleqabaGaamiEaaaaaaa@4BCC@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   <m:mo>+</m:mo><m:mi>x</m:mi><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   <m:mo>&#x2212;</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyzamaaCaaaleqabaGaamiEaaaakiabgUcaRiaadIhacaWGLbWaaWbaaSqabeaacaWG4baaaOGaeyOeI0IaamyzamaaCaaaleqabaGaamiEaaaaaaa@3F0A@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>x</m:mi><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiEaiaadwgadaahaaWcbeqaaiaadIhaaaaaaa@38FF@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">6. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mo stretchy='false'>(</m:mo><m:mn>4</m:mn><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>5</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iGacYgacaGGUbGaaiikaiaaisdacaWG4bGaey4kaSIaaGynaiaacMcaaaa@3E8B@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">Put <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>u</m:mi><m:mo>=</m:mo><m:mn>4</m:mn><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>5</m:mn>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2da9iaaisdacaWG4bGaey4kaSIaaGynaaaa@3B4A@</m:annotation>
 </m:semantics>
</m:math>,
then <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>u</m:mi>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iGacYgacaGGUbGaamyDaaaa@3AD0@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaamizaiaadMhaaeaacaWGKbGaamyDaaaadaWcaaqaaiaadsgacaWG1baabaGaamizaiaadIhaaaaaaa@4284@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mn>1</m:mn>
    <m:mi>u</m:mi>
   </m:mfrac>
   <m:mo stretchy='false'>(</m:mo><m:mn>4</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaaIXaaabaGaamyDaaaacaGGOaGaaGinaiaacMcaaaa@39CA@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mn>4</m:mn>
    <m:mi>u</m:mi>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mn>4</m:mn>
    <m:mrow>
     <m:mn>4</m:mn><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>5</m:mn>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaaI0aaabaGaamyDaaaacqGH9aqpdaWcaaqaaiaaisdaaeaacaaI0aGaamiEaiabgUcaRiaaiwdaaaaaaa@3CE6@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">7. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mo stretchy='false'>(</m:mo><m:mn>2</m:mn><m:msup>
    <m:mi>x</m:mi>
    <m:mn>2</m:mn>
   </m:msup>
   <m:mo>&#x2212;</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>5</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iGacYgacaGGUbGaaiikaiaaikdacaWG4bWaaWbaaSqabeaacaaIYaaaaOGaeyOeI0IaamiEaiabgUcaRiaaiwdacaGGPaaaaa@4166@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">Put, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>u</m:mi><m:mo>=</m:mo><m:mn>2</m:mn><m:msup>
    <m:mi>x</m:mi>
    <m:mn>2</m:mn>
   </m:msup>
   <m:mo>&#x2212;</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>5</m:mn>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2da9iaaikdacaWG4bWaaWbaaSqabeaacaaIYaaaaOGaeyOeI0IaamiEaiabgUcaRiaaiwdaaaa@3E25@</m:annotation>
 </m:semantics>
</m:math>,
then <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>u</m:mi>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iGacYgacaGGUbGaamyDaaaa@3AD0@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>.</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaamizaiaadMhaaeaacaWGKbGaamyDaaaacaGGUaWaaSaaaeaacaWGKbGaamyDaaqaaiaadsgacaWG4baaaaaa@4336@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mn>1</m:mn>
    <m:mi>u</m:mi>
   </m:mfrac>
   <m:mo stretchy='false'>(</m:mo><m:mn>4</m:mn><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>1</m:mn><m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaaIXaaabaGaamyDaaaacaGGOaGaaGinaiaadIhacqGHsislcaaIXaGaaiykaaaa@3C6F@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mn>4</m:mn><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>1</m:mn>
    </m:mrow>
    <m:mi>u</m:mi>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mn>4</m:mn><m:mi>x</m:mi><m:mo>&#x2212;</m:mo><m:mn>1</m:mn>
    </m:mrow>
    <m:mrow>
     <m:mn>2</m:mn><m:msup>
      <m:mi>x</m:mi>
      <m:mn>2</m:mn>
     </m:msup>
     <m:mo>&#x2212;</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>5</m:mn>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaaI0aGaamiEaiabgkHiTiaaigdaaeaacaWG1baaaiabg2da9maalaaabaGaaGinaiaadIhacqGHsislcaaIXaaabaGaaGOmaiaadIhadaahaaWcbeqaaiaaikdaaaGccqGHsislcaWG4bGaey4kaSIaaGynaaaaaaa@450B@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">8. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mo stretchy='false'>(</m:mo><m:mn>1</m:mn><m:mo>+</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   <m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iGacYgacaGGUbGaaiikaiaaigdacqGHRaWkcaWGLbWaaWbaaSqabeaacaWG4baaaOGaaiykaaaa@3EEA@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">Put <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>u</m:mi><m:mo>=</m:mo><m:mn>1</m:mn><m:mo>+</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2da9iaaigdacqGHRaWkcaWGLbWaaWbaaSqabeaacaWG4baaaaaa@3B9F@</m:annotation>
 </m:semantics>
</m:math>,
then <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>u</m:mi>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iGacYgacaGGUbGaamyDaaaa@3AD0@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">So, <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>u</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaamizaiaadMhaaeaacaWGKbGaamyDaaaadaWcaaqaaiaadsgacaWG1baabaGaamizaiaadIhaaaaaaa@4283@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mn>1</m:mn>
    <m:mi>u</m:mi>
   </m:mfrac>
   <m:mo stretchy='false'>(</m:mo><m:msup>
    <m:mi>e</m:mi>
    <m:mi>x</m:mi>
   </m:msup>
   <m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaaIXaaabaGaamyDaaaacaGGOaGaamyzamaaCaaaleqabaGaamiEaaaakiaacMcaaaa@3B2A@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:msup>
      <m:mi>e</m:mi>
      <m:mi>x</m:mi>
     </m:msup>
     
    </m:mrow>
    <m:mi>u</m:mi>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:msup>
      <m:mi>e</m:mi>
      <m:mi>x</m:mi>
     </m:msup>
     
    </m:mrow>
    <m:mrow>
     <m:mn>1</m:mn><m:mo>+</m:mo><m:msup>
      <m:mi>e</m:mi>
      <m:mi>x</m:mi>
     </m:msup>
     
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGLbWaaWbaaSqabeaacaWG4baaaaGcbaGaamyDaaaacqGH9aqpdaWcaaqaaiaadwgadaahaaWcbeqaaiaadIhaaaaakeaacaaIXaGaey4kaSIaamyzamaaCaaaleqabaGaamiEaaaaaaaaaa@3FFB@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">9. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>x</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn>
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9maalaaabaGaciiBaiaac6gacaWG4baabaGaamiEaiabgUcaRiaaikdaaaaaaa@3D7E@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal"><m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mfrac>
    <m:mrow>
     <m:mo stretchy='false'>(</m:mo><m:mfrac>
      <m:mn>1</m:mn>
      <m:mi>x</m:mi>
     </m:mfrac>
     <m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn><m:mo stretchy='false'>)</m:mo><m:mo>&#x2212;</m:mo><m:mo stretchy='false'>(</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>x</m:mi><m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:mn>1</m:mn><m:mo stretchy='false'>)</m:mo>
    </m:mrow>
    <m:mrow>
     <m:msup>
      <m:mrow>
       <m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn><m:mo stretchy='false'>)</m:mo>
      </m:mrow>
      <m:mn>2</m:mn>
     </m:msup>
     
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9maalaaabaGaaiikamaalaaabaGaaGymaaqaaiaadIhaaaGaaiykaiaacIcacaWG4bGaey4kaSIaaGOmaiaacMcacqGHsislcaGGOaGaciiBaiaac6gacaWG4bGaaiykaiaacIcacaaIXaGaaiykaaqaaiaacIcacaWG4bGaey4kaSIaaGOmaiaacMcadaahaaWcbeqaaiaaikdaaaaaaaaa@4E0E@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mn>1</m:mn>
    <m:mrow>
     <m:mi>x</m:mi><m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn><m:mo stretchy='false'>)</m:mo>
    </m:mrow>
   </m:mfrac>
   <m:mo>&#x2212;</m:mo><m:mfrac>
    <m:mrow>
     <m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>x</m:mi>
    </m:mrow>
    <m:mrow>
     <m:msup>
      <m:mrow>
       <m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>2</m:mn><m:mo stretchy='false'>)</m:mo>
      </m:mrow>
      <m:mn>2</m:mn>
     </m:msup>
     
    </m:mrow>
   </m:mfrac>
   
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaaIXaaabaGaamiEaiaacIcacaWG4bGaey4kaSIaaGOmaiaacMcaaaGaeyOeI0YaaSaaaeaaciGGSbGaaiOBaiaadIhaaeaacaGGOaGaamiEaiabgUcaRiaaikdacaGGPaWaaWbaaSqabeaacaaIYaaaaaaaaaa@4465@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">10. <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mi>y</m:mi><m:mo>=</m:mo><m:mi>x</m:mi><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>x</m:mi>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEaiabg2da9iaadIhaciGGSbGaaiOBaiaadIhaaaa@3BD0@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal"><m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mfrac>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>y</m:mi>
    </m:mrow>
    <m:mrow>
     <m:mi>d</m:mi><m:mi>x</m:mi>
    </m:mrow>
   </m:mfrac>
   <m:mo>=</m:mo><m:mo stretchy='false'>(</m:mo><m:mn>1</m:mn><m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>x</m:mi><m:mo stretchy='false'>)</m:mo><m:mo>+</m:mo><m:mo stretchy='false'>(</m:mo><m:mi>x</m:mi><m:mo stretchy='false'>)</m:mo><m:mo stretchy='false'>(</m:mo><m:mfrac>
    <m:mn>1</m:mn>
    <m:mi>x</m:mi>
   </m:mfrac>
   <m:mo stretchy='false'>)</m:mo>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaacaWGKbGaamyEaaqaaiaadsgacaWG4baaaiabg2da9iaacIcacaaIXaGaaiykaiaacIcaciGGSbGaaiOBaiaadIhacaGGPaGaey4kaSIaaiikaiaadIhacaGGPaGaaiikamaalaaabaGaaGymaaqaaiaadIhaaaGaaiykaaaa@4778@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">= <m:math style='background-color:#'>
 <m:semantics>
  <m:mrow>
   <m:mo stretchy='false'>(</m:mo><m:mi>ln</m:mi><m:mo>&#x2061;</m:mo><m:mi>x</m:mi><m:mo stretchy='false'>)</m:mo><m:mtext>&#x2009;</m:mtext><m:mo>+</m:mo><m:mn>1</m:mn>
  </m:mrow>
 <m:annotation encoding='MathType-MTEF'>
 MathType@MTEF@5@5@+=feaagaart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaiikaiGacYgacaGGUbGaamiEaiaacMcacaaMe8Uaey4kaSIaaGymaaaa@3D52@</m:annotation>
 </m:semantics>
</m:math></p>

<p class="MsoNormal">&#xA0;</p>

</div>

<br/>
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<hr/>Copyright &#169; Dayal D. Purohit, Ph.D.(Mathematics)
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