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}
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 8 - Techniques of Integration - 8.4 Integrals Involving Hyperbolic and Inverse Hyperbolic Functions - Exercises - Page 415: 1
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