Answer
$-\frac{1}{2}.$
Work Step by Step
$g(2\theta)=cos(120^{O})=cos\frac{2\pi}{3}=-\frac{1}{2}.$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 6 - Trigonometric Functions - 6.2 Trigonometric Functions: Unit Circle Approach - 6.2 Assess Your Understanding - Page 379: 102
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