Calculus (3rd Edition)

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: 5


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Work Step by Step

We refer to Figure 2 on page 377. We can see that since $\sinh x$ is an odd function, then for each $t$, $\sinh x=t$ has only one solution. But since $\cosh x$ is a positive even function, then for each $t\gt 1$, $\cosh x=t$ has two solutions.
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