Answer
$0\leq x\leq\pi$
Work Step by Step
$\cos^{-1}(\cos(x))=x$ where $0\leq x\leq\pi.$ (as this is the range of $f(x)=\cos^{-1}(x).$)
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - 7.1 The Inverse Sine, Cosine, and Tangent Functions - 7.1 Assess Your Understanding - Page 450: 8
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