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Calculus
Derivatives
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Find the derivative of \(\displaystyle y=\cos{\left(e^{x} \right)}\).


The outer function is \(\displaystyle f(u) = \cos{\left(u \right)}\) and the inner function \(\displaystyle u = e^{x}\). The chain rule gives \(\displaystyle y'= \frac{df}{du}\frac{du}{dx}\). \(\displaystyle y' = - \sin{\left(u \right)}(e^{x}) = - e^{x} \sin{\left(e^{x} \right)}\).

Download \(\LaTeX\)

\begin{question}Find the derivative of $y=\cos{\left(e^{x} \right)}$. 
    \soln{9cm}{The outer function is $f(u) = \cos{\left(u \right)}$ and the inner function $u = e^{x}$. The chain rule gives $y'= \frac{df}{du}\frac{du}{dx}$. $y' = - \sin{\left(u \right)}(e^{x}) = - e^{x} \sin{\left(e^{x} \right)}$. }

\end{question}

Download Question and Solution Environment\(\LaTeX\)
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HTML for Canvas
<p> <p>Find the derivative of  <img class="equation_image" title=" \displaystyle y=\cos{\left(e^{x} \right)} " src="/equation_images/%20%5Cdisplaystyle%20y%3D%5Ccos%7B%5Cleft%28e%5E%7Bx%7D%20%5Cright%29%7D%20" alt="LaTeX:  \displaystyle y=\cos{\left(e^{x} \right)} " data-equation-content=" \displaystyle y=\cos{\left(e^{x} \right)} " /> . </p> </p>
HTML for Canvas
<p> <p>The outer function is  <img class="equation_image" title=" \displaystyle f(u) = \cos{\left(u \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%28u%29%20%3D%20%5Ccos%7B%5Cleft%28u%20%5Cright%29%7D%20" alt="LaTeX:  \displaystyle f(u) = \cos{\left(u \right)} " data-equation-content=" \displaystyle f(u) = \cos{\left(u \right)} " />  and the inner function  <img class="equation_image" title=" \displaystyle u = e^{x} " src="/equation_images/%20%5Cdisplaystyle%20u%20%3D%20e%5E%7Bx%7D%20" alt="LaTeX:  \displaystyle u = e^{x} " data-equation-content=" \displaystyle u = e^{x} " /> . The chain rule gives  <img class="equation_image" title=" \displaystyle y'= \frac{df}{du}\frac{du}{dx} " src="/equation_images/%20%5Cdisplaystyle%20y%27%3D%20%5Cfrac%7Bdf%7D%7Bdu%7D%5Cfrac%7Bdu%7D%7Bdx%7D%20" alt="LaTeX:  \displaystyle y'= \frac{df}{du}\frac{du}{dx} " data-equation-content=" \displaystyle y'= \frac{df}{du}\frac{du}{dx} " /> .  <img class="equation_image" title=" \displaystyle y' = - \sin{\left(u \right)}(e^{x}) = - e^{x} \sin{\left(e^{x} \right)} " src="/equation_images/%20%5Cdisplaystyle%20y%27%20%3D%20-%20%5Csin%7B%5Cleft%28u%20%5Cright%29%7D%28e%5E%7Bx%7D%29%20%3D%20-%20e%5E%7Bx%7D%20%5Csin%7B%5Cleft%28e%5E%7Bx%7D%20%5Cright%29%7D%20" alt="LaTeX:  \displaystyle y' = - \sin{\left(u \right)}(e^{x}) = - e^{x} \sin{\left(e^{x} \right)} " data-equation-content=" \displaystyle y' = - \sin{\left(u \right)}(e^{x}) = - e^{x} \sin{\left(e^{x} \right)} " /> . </p> </p>