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Questions: Algebra BusinessCalculus
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Find the derivative of \(\displaystyle y = \ln{\left(x \right)} \sin{\left(x \right)}\).
Using the product rule with \(\displaystyle f = \sin{\left(x \right)}\), \(\displaystyle f' = \cos{\left(x \right)}\), \(\displaystyle g = \ln{\left(x \right)}\), and \(\displaystyle g'= \frac{1}{x}\) gives:
\begin{equation*} y' = (\ln{\left(x \right)})(\cos{\left(x \right)}) + (\sin{\left(x \right)})(\frac{1}{x}) = \ln{\left(x \right)} \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x} \end{equation*}
\begin{question}Find the derivative of $y = \ln{\left(x \right)} \sin{\left(x \right)}$.
\soln{9cm}{Using the product rule with $f = \sin{\left(x \right)}$, $f' = \cos{\left(x \right)}$, $g = \ln{\left(x \right)}$, and $g'= \frac{1}{x}$ gives:\newline
\begin{equation*} y' = (\ln{\left(x \right)})(\cos{\left(x \right)}) + (\sin{\left(x \right)})(\frac{1}{x}) = \ln{\left(x \right)} \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x} \end{equation*}}
\end{question}
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\begin{document}\begin{question}(10pts) The question goes here!
\soln{9cm}{The solution goes here.}
\end{question}\end{document}<p> <p>Find the derivative of <img class="equation_image" title=" \displaystyle y = \ln{\left(x \right)} \sin{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20y%20%3D%20%5Cln%7B%5Cleft%28x%20%5Cright%29%7D%20%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX: \displaystyle y = \ln{\left(x \right)} \sin{\left(x \right)} " data-equation-content=" \displaystyle y = \ln{\left(x \right)} \sin{\left(x \right)} " /> . </p> </p><p> <p>Using the product rule with <img class="equation_image" title=" \displaystyle f = \sin{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%20%3D%20%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX: \displaystyle f = \sin{\left(x \right)} " data-equation-content=" \displaystyle f = \sin{\left(x \right)} " /> , <img class="equation_image" title=" \displaystyle f' = \cos{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%27%20%3D%20%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX: \displaystyle f' = \cos{\left(x \right)} " data-equation-content=" \displaystyle f' = \cos{\left(x \right)} " /> , <img class="equation_image" title=" \displaystyle g = \ln{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20g%20%3D%20%5Cln%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX: \displaystyle g = \ln{\left(x \right)} " data-equation-content=" \displaystyle g = \ln{\left(x \right)} " /> , and <img class="equation_image" title=" \displaystyle g'= \frac{1}{x} " src="/equation_images/%20%5Cdisplaystyle%20g%27%3D%20%5Cfrac%7B1%7D%7Bx%7D%20" alt="LaTeX: \displaystyle g'= \frac{1}{x} " data-equation-content=" \displaystyle g'= \frac{1}{x} " /> gives:<br>
<img class="equation_image" title=" y' = (\ln{\left(x \right)})(\cos{\left(x \right)}) + (\sin{\left(x \right)})(\frac{1}{x}) = \ln{\left(x \right)} \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x} " src="/equation_images/%20%20y%27%20%3D%20%20%28%5Cln%7B%5Cleft%28x%20%5Cright%29%7D%29%28%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%29%20%2B%20%28%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%29%28%5Cfrac%7B1%7D%7Bx%7D%29%20%3D%20%5Cln%7B%5Cleft%28x%20%5Cright%29%7D%20%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cfrac%7B%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%7D%7Bx%7D%20%20" alt="LaTeX: y' = (\ln{\left(x \right)})(\cos{\left(x \right)}) + (\sin{\left(x \right)})(\frac{1}{x}) = \ln{\left(x \right)} \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x} " data-equation-content=" y' = (\ln{\left(x \right)})(\cos{\left(x \right)}) + (\sin{\left(x \right)})(\frac{1}{x}) = \ln{\left(x \right)} \cos{\left(x \right)} + \frac{\sin{\left(x \right)}}{x} " /> </p> </p>