## Calculus (3rd Edition)

Published by W. H. Freeman

# Chapter 8 - Techniques of Integration - 8.4 Integrals Involving Hyperbolic and Inverse Hyperbolic Functions - Exercises - Page 415: 1

#### Answer

$$\frac{1}{3} \sinh (3 x)+C$$

#### Work Step by Step

\begin{aligned} \int \cosh (3 x) d x &=\frac{1}{3} \int 3 \cdot \cosh (3 x) d x \\ &=\frac{1}{3} \sinh (3 x)+C \end{aligned}

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