Answer
$\pi$
Work Step by Step
$y=\cos^{-1}x$
Domain:$[-1, 1] $
Range: $[0, \pi]$
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$y$ is the number from $[0, \pi]$ such that $\cos y=-1$
$\cos\pi=-1,\quad$and $\pi\in [0, \pi]$, so
$\cos^{-1}(-1)=\pi$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 7 - Trigonometric Identities and Equations - 7.5 Inverse Circular Functions - 7.5 Exercises - Page 708: 15
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