Answer
See explanation.
Work Step by Step
The restriction on the cosine function is to limit its domain in
$[0,\pi]$. In this way, the limited section of the curve will pass the horizontal line test and has an inverse function.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.7 - Inverse Trigonometric Functions - Exercise Set - Page 628: 103
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