Answer
$ -\frac{1}{4} $
Work Step by Step
$cos^{-1}(2x)=\frac{2\pi}{3} \longrightarrow 2x=cos\frac{2\pi}{3}=-\frac{1}{2} \longrightarrow x=-\frac{1}{4} $
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: 69
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