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Find the derivative of \(\displaystyle y = (\sin{\left(x \right)})(7 - 3 x)(6 x - 1)\).
Identifying \(\displaystyle f=\sin{\left(x \right)}\) and \(\displaystyle g=\left(7 - 3 x\right) \left(6 x - 1\right)\) and using the product rule with \(\displaystyle f=\sin{\left(x \right)} \implies f'=\cos{\left(x \right)}\). This leaves g as \(\displaystyle g = \left(7 - 3 x\right) \left(6 x - 1\right)\) which also requires the product rule. Pushing down in the new product rule \(\displaystyle f=7 - 3 x \implies f'=-3\) and \(\displaystyle g=6 x - 1 \implies g'=6\). Popping up a level gives \(\displaystyle g'=(6 x - 1)(-3)+(7 - 3 x)(6)\)Popping up again (Back to the original problem) gives \(\displaystyle f'=(\sin{\left(x \right)})(45 - 36 x)+(\left(7 - 3 x\right) \left(6 x - 1\right))(\cos{\left(x \right)})=\left(3 - 18 x\right) \sin{\left(x \right)} + \left(7 - 3 x\right) \left(6 x - 1\right) \cos{\left(x \right)} + \left(42 - 18 x\right) \sin{\left(x \right)}\)
\begin{question}Find the derivative of $y = (\sin{\left(x \right)})(7 - 3 x)(6 x - 1)$.
\soln{9cm}{Identifying $f=\sin{\left(x \right)}$ and $g=\left(7 - 3 x\right) \left(6 x - 1\right)$ and using the product rule with $f=\sin{\left(x \right)} \implies f'=\cos{\left(x \right)}$. This leaves g as $g = \left(7 - 3 x\right) \left(6 x - 1\right)$ which also requires the product rule. Pushing down in the new product rule $f=7 - 3 x \implies f'=-3$ and $g=6 x - 1 \implies g'=6$. Popping up a level gives $g'=(6 x - 1)(-3)+(7 - 3 x)(6)$Popping up again (Back to the original problem) gives $f'=(\sin{\left(x \right)})(45 - 36 x)+(\left(7 - 3 x\right) \left(6 x - 1\right))(\cos{\left(x \right)})=\left(3 - 18 x\right) \sin{\left(x \right)} + \left(7 - 3 x\right) \left(6 x - 1\right) \cos{\left(x \right)} + \left(42 - 18 x\right) \sin{\left(x \right)}$}
\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 = (\sin{\left(x \right)})(7 - 3 x)(6 x - 1) " src="/equation_images/%20%5Cdisplaystyle%20y%20%3D%20%28%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%29%287%20-%203%20x%29%286%20x%20-%201%29%20" alt="LaTeX: \displaystyle y = (\sin{\left(x \right)})(7 - 3 x)(6 x - 1) " data-equation-content=" \displaystyle y = (\sin{\left(x \right)})(7 - 3 x)(6 x - 1) " /> .</p> </p><p> <p>Identifying <img class="equation_image" title=" \displaystyle f=\sin{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%3D%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)} " /> and <img class="equation_image" title=" \displaystyle g=\left(7 - 3 x\right) \left(6 x - 1\right) " src="/equation_images/%20%5Cdisplaystyle%20g%3D%5Cleft%287%20-%203%20x%5Cright%29%20%5Cleft%286%20x%20-%201%5Cright%29%20" alt="LaTeX: \displaystyle g=\left(7 - 3 x\right) \left(6 x - 1\right) " data-equation-content=" \displaystyle g=\left(7 - 3 x\right) \left(6 x - 1\right) " /> and using the product rule with <img class="equation_image" title=" \displaystyle f=\sin{\left(x \right)} \implies f'=\cos{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%3D%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%20%5Cimplies%20f%27%3D%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX: \displaystyle f=\sin{\left(x \right)} \implies f'=\cos{\left(x \right)} " data-equation-content=" \displaystyle f=\sin{\left(x \right)} \implies f'=\cos{\left(x \right)} " /> . This leaves g as <img class="equation_image" title=" \displaystyle g = \left(7 - 3 x\right) \left(6 x - 1\right) " src="/equation_images/%20%5Cdisplaystyle%20g%20%3D%20%5Cleft%287%20-%203%20x%5Cright%29%20%5Cleft%286%20x%20-%201%5Cright%29%20" alt="LaTeX: \displaystyle g = \left(7 - 3 x\right) \left(6 x - 1\right) " data-equation-content=" \displaystyle g = \left(7 - 3 x\right) \left(6 x - 1\right) " /> which also requires the product rule. Pushing down in the new product rule <img class="equation_image" title=" \displaystyle f=7 - 3 x \implies f'=-3 " src="/equation_images/%20%5Cdisplaystyle%20f%3D7%20-%203%20x%20%5Cimplies%20f%27%3D-3%20" alt="LaTeX: \displaystyle f=7 - 3 x \implies f'=-3 " data-equation-content=" \displaystyle f=7 - 3 x \implies f'=-3 " /> and <img class="equation_image" title=" \displaystyle g=6 x - 1 \implies g'=6 " src="/equation_images/%20%5Cdisplaystyle%20g%3D6%20x%20-%201%20%5Cimplies%20g%27%3D6%20" alt="LaTeX: \displaystyle g=6 x - 1 \implies g'=6 " data-equation-content=" \displaystyle g=6 x - 1 \implies g'=6 " /> . Popping up a level gives <img class="equation_image" title=" \displaystyle g'=(6 x - 1)(-3)+(7 - 3 x)(6) " src="/equation_images/%20%5Cdisplaystyle%20g%27%3D%286%20x%20-%201%29%28-3%29%2B%287%20-%203%20x%29%286%29%20" alt="LaTeX: \displaystyle g'=(6 x - 1)(-3)+(7 - 3 x)(6) " data-equation-content=" \displaystyle g'=(6 x - 1)(-3)+(7 - 3 x)(6) " /> Popping up again (Back to the original problem) gives <img class="equation_image" title=" \displaystyle f'=(\sin{\left(x \right)})(45 - 36 x)+(\left(7 - 3 x\right) \left(6 x - 1\right))(\cos{\left(x \right)})=\left(3 - 18 x\right) \sin{\left(x \right)} + \left(7 - 3 x\right) \left(6 x - 1\right) \cos{\left(x \right)} + \left(42 - 18 x\right) \sin{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20f%27%3D%28%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%29%2845%20-%2036%20x%29%2B%28%5Cleft%287%20-%203%20x%5Cright%29%20%5Cleft%286%20x%20-%201%5Cright%29%29%28%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%29%3D%5Cleft%283%20-%2018%20x%5Cright%29%20%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cleft%287%20-%203%20x%5Cright%29%20%5Cleft%286%20x%20-%201%5Cright%29%20%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cleft%2842%20-%2018%20x%5Cright%29%20%5Csin%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX: \displaystyle f'=(\sin{\left(x \right)})(45 - 36 x)+(\left(7 - 3 x\right) \left(6 x - 1\right))(\cos{\left(x \right)})=\left(3 - 18 x\right) \sin{\left(x \right)} + \left(7 - 3 x\right) \left(6 x - 1\right) \cos{\left(x \right)} + \left(42 - 18 x\right) \sin{\left(x \right)} " data-equation-content=" \displaystyle f'=(\sin{\left(x \right)})(45 - 36 x)+(\left(7 - 3 x\right) \left(6 x - 1\right))(\cos{\left(x \right)})=\left(3 - 18 x\right) \sin{\left(x \right)} + \left(7 - 3 x\right) \left(6 x - 1\right) \cos{\left(x \right)} + \left(42 - 18 x\right) \sin{\left(x \right)} " /> </p> </p>