Answer
See the details below.
Work Step by Step
Since $\sinh x$ is an odd function and $\cosh x$ is even, then using the fact that
$$\tanh x=\frac{\sinh x}{\cosh x}$$
we see that $\tanh x$ is an odd function.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 7 - Exponential Functions - 7.9 Hyperbolic Functions - Exercises - Page 384: 4
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