Answer
$y=\frac{2\pi}{3}$
Work Step by Step
RECALL:
$y=\cos^{-1}{x} \longrightarrow \cos{y}=x$
Note that $\cos{(\frac{2\pi}{3})}=-\frac{1}{2}$.
Therefore,
$y=\cos^{-1}{(-\frac{1}{2})}\longrightarrow y=\frac{2\pi}{3}$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 6 - Review Exercises - Page 291: 6
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