Answer
$\frac{4\pi}{5}$
Work Step by Step
We know that $f^{-1}(f(x))=x$,.
Hence,
$\cos^{-1}\left(\cos(\frac{4\pi}{5})\right)=\frac{4\pi}{5}$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Trigonometry and Periodic Functions - 7.1 The Inverse Sine, Cosine, and Tangent Functions - 7.1 Assess Your Understanding - Page 451: 39
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