Calculus Concepts: An Informal Approach to the Mathematics of Change 5th Edition

Published by Brooks Cole
ISBN 10: 1-43904-957-2
ISBN 13: 978-1-43904-957-0

Chapter 3 - Determining Change: Derivatives - 3.4 Activities - Page 224: 32

Answer

inside: $g(x)=3\ln x-7$ outside: $f(g)= 5 \sin (g(x))-4$ derivative: $f^{\prime}(x)=\dfrac{15\cos ( 3\ln x-7)}{x}$

Work Step by Step

Given $$ f(x)=5 \sin (3 \ln x-7)-4 $$ Use the chain rule to take the derivative $$ \frac{d f(g(x))}{d x}=f^{\prime}(g(x)) g^{\prime}(x) $$ Here $g(x)= 3 \ln x-7 $ and $f(g)=5 \sin (g(x))-4,$ then \begin{align*} f^{\prime}(x) &=\left( 5 \sin (g(x))-4\right)^{\prime} \\ &=(5\cos (g(x)))g^{\prime}(x) \\ &=(5\cos (g(x))) \frac{3}{x}\\ &= \frac{15\cos ( 3\ln x-7)}{x} \end{align*}
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