Answer
not defined.
Work Step by Step
Use the properties of an inverse function, as $-1.6\lt -1$, $cos(cos^{-1}(-1.6))$ is not defined.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 6 - Analytic Trigonometry - Chapter Review - Review Exercises - Page 527: 17
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