Answer
$cos^{-1}~1=0$
Work Step by Step
The range of $cos^{-1}~x$ is $[0,\pi]$. So,
$cos^{-1}~1=0$, because $cos(0)=1$ and $0\leq0\leq\pi$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 6 - Review Questions - Page 501: 95
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