Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 6 - Inverse Functions - Review - Exercises - Page 505: 43


$$y' =3\tanh 3x$$

Work Step by Step

Given $$ y=\ln\cosh (3x) $$ Then \begin{align*} y'&=\frac{3\sinh 3x}{\cosh 3x }\\ &=3\tanh 3x \end{align*}
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