Answer
$\pi$
Work Step by Step
Let $\cos^{-1}(-1)= y$. Then, $\cos y= -1$.
As we know, $\cos \pi= -1$.
∴ y=$\pi$.
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 4 - Section 4.7 - Inverse Trigonometric Functions - 4.7 Problem Set - Page 261: 19
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