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Calculus
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Find the derivative of \(\displaystyle y = (\cos{\left(x \right)})(2 - 4 x)(7 x + 5)\).


Identifying \(\displaystyle f=\cos{\left(x \right)}\) and \(\displaystyle g=\left(2 - 4 x\right) \left(7 x + 5\right)\) and using the product rule with \(\displaystyle f=\cos{\left(x \right)} \implies f'=- \sin{\left(x \right)}\). This leaves g as \(\displaystyle g = \left(2 - 4 x\right) \left(7 x + 5\right)\) which also requires the product rule. Pushing down in the new product rule \(\displaystyle f=2 - 4 x \implies f'=-4\) and \(\displaystyle g=7 x + 5 \implies g'=7\). Popping up a level gives \(\displaystyle g'=(7 x + 5)(-4)+(2 - 4 x)(7)\)Popping up again (Back to the original problem) gives \(\displaystyle f'=(\cos{\left(x \right)})(- 56 x - 6)+(\left(2 - 4 x\right) \left(7 x + 5\right))(- \sin{\left(x \right)})=- \left(2 - 4 x\right) \left(7 x + 5\right) \sin{\left(x \right)} + \left(14 - 28 x\right) \cos{\left(x \right)} + \left(- 28 x - 20\right) \cos{\left(x \right)}\)

Download \(\LaTeX\)

\begin{question}Find the derivative of $y = (\cos{\left(x \right)})(2 - 4 x)(7 x + 5)$.
    \soln{9cm}{Identifying $f=\cos{\left(x \right)}$ and $g=\left(2 - 4 x\right) \left(7 x + 5\right)$ and using the product rule with $f=\cos{\left(x \right)} \implies f'=- \sin{\left(x \right)}$. This leaves g as $g = \left(2 - 4 x\right) \left(7 x + 5\right)$ which also requires the product rule. Pushing down in the new product rule $f=2 - 4 x \implies f'=-4$ and $g=7 x + 5 \implies g'=7$. Popping up a level gives $g'=(7 x + 5)(-4)+(2 - 4 x)(7)$Popping up again (Back to the original problem) gives $f'=(\cos{\left(x \right)})(- 56 x - 6)+(\left(2 - 4 x\right) \left(7 x + 5\right))(- \sin{\left(x \right)})=- \left(2 - 4 x\right) \left(7 x + 5\right) \sin{\left(x \right)} + \left(14 - 28 x\right) \cos{\left(x \right)} + \left(- 28 x - 20\right) \cos{\left(x \right)}$}

\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(x \right)})(2 - 4 x)(7 x + 5) " src="/equation_images/%20%5Cdisplaystyle%20y%20%3D%20%28%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%29%282%20-%204%20x%29%287%20x%20%2B%205%29%20" alt="LaTeX:  \displaystyle y = (\cos{\left(x \right)})(2 - 4 x)(7 x + 5) " data-equation-content=" \displaystyle y = (\cos{\left(x \right)})(2 - 4 x)(7 x + 5) " /> .</p> </p>
HTML for Canvas
<p> <p>Identifying  <img class="equation_image" title=" \displaystyle f=\cos{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%3D%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)} " />  and  <img class="equation_image" title=" \displaystyle g=\left(2 - 4 x\right) \left(7 x + 5\right) " src="/equation_images/%20%5Cdisplaystyle%20g%3D%5Cleft%282%20-%204%20x%5Cright%29%20%5Cleft%287%20x%20%2B%205%5Cright%29%20" alt="LaTeX:  \displaystyle g=\left(2 - 4 x\right) \left(7 x + 5\right) " data-equation-content=" \displaystyle g=\left(2 - 4 x\right) \left(7 x + 5\right) " />  and using the product rule with  <img class="equation_image" title=" \displaystyle f=\cos{\left(x \right)} \implies f'=- \sin{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%3D%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%20%5Cimplies%20f%27%3D-%20%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX:  \displaystyle f=\cos{\left(x \right)} \implies f'=- \sin{\left(x \right)} " data-equation-content=" \displaystyle f=\cos{\left(x \right)} \implies f'=- \sin{\left(x \right)} " /> . This leaves g as  <img class="equation_image" title=" \displaystyle g = \left(2 - 4 x\right) \left(7 x + 5\right) " src="/equation_images/%20%5Cdisplaystyle%20g%20%3D%20%5Cleft%282%20-%204%20x%5Cright%29%20%5Cleft%287%20x%20%2B%205%5Cright%29%20" alt="LaTeX:  \displaystyle g = \left(2 - 4 x\right) \left(7 x + 5\right) " data-equation-content=" \displaystyle g = \left(2 - 4 x\right) \left(7 x + 5\right) " />  which also requires the product rule. Pushing down in the new product rule  <img class="equation_image" title=" \displaystyle f=2 - 4 x \implies f'=-4 " src="/equation_images/%20%5Cdisplaystyle%20f%3D2%20-%204%20x%20%5Cimplies%20f%27%3D-4%20" alt="LaTeX:  \displaystyle f=2 - 4 x \implies f'=-4 " data-equation-content=" \displaystyle f=2 - 4 x \implies f'=-4 " />  and  <img class="equation_image" title=" \displaystyle g=7 x + 5 \implies g'=7 " src="/equation_images/%20%5Cdisplaystyle%20g%3D7%20x%20%2B%205%20%5Cimplies%20g%27%3D7%20" alt="LaTeX:  \displaystyle g=7 x + 5 \implies g'=7 " data-equation-content=" \displaystyle g=7 x + 5 \implies g'=7 " /> . Popping up a level gives  <img class="equation_image" title=" \displaystyle g'=(7 x + 5)(-4)+(2 - 4 x)(7) " src="/equation_images/%20%5Cdisplaystyle%20g%27%3D%287%20x%20%2B%205%29%28-4%29%2B%282%20-%204%20x%29%287%29%20" alt="LaTeX:  \displaystyle g'=(7 x + 5)(-4)+(2 - 4 x)(7) " data-equation-content=" \displaystyle g'=(7 x + 5)(-4)+(2 - 4 x)(7) " /> Popping up again (Back to the original problem) gives  <img class="equation_image" title=" \displaystyle f'=(\cos{\left(x \right)})(- 56 x - 6)+(\left(2 - 4 x\right) \left(7 x + 5\right))(- \sin{\left(x \right)})=- \left(2 - 4 x\right) \left(7 x + 5\right) \sin{\left(x \right)} + \left(14 - 28 x\right) \cos{\left(x \right)} + \left(- 28 x - 20\right) \cos{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%27%3D%28%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%29%28-%2056%20x%20-%206%29%2B%28%5Cleft%282%20-%204%20x%5Cright%29%20%5Cleft%287%20x%20%2B%205%5Cright%29%29%28-%20%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%29%3D-%20%5Cleft%282%20-%204%20x%5Cright%29%20%5Cleft%287%20x%20%2B%205%5Cright%29%20%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cleft%2814%20-%2028%20x%5Cright%29%20%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cleft%28-%2028%20x%20-%2020%5Cright%29%20%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX:  \displaystyle f'=(\cos{\left(x \right)})(- 56 x - 6)+(\left(2 - 4 x\right) \left(7 x + 5\right))(- \sin{\left(x \right)})=- \left(2 - 4 x\right) \left(7 x + 5\right) \sin{\left(x \right)} + \left(14 - 28 x\right) \cos{\left(x \right)} + \left(- 28 x - 20\right) \cos{\left(x \right)} " data-equation-content=" \displaystyle f'=(\cos{\left(x \right)})(- 56 x - 6)+(\left(2 - 4 x\right) \left(7 x + 5\right))(- \sin{\left(x \right)})=- \left(2 - 4 x\right) \left(7 x + 5\right) \sin{\left(x \right)} + \left(14 - 28 x\right) \cos{\left(x \right)} + \left(- 28 x - 20\right) \cos{\left(x \right)} " /> </p> </p>