Answer
$120^\circ, 240^\circ$
Work Step by Step
Given $cos\theta=-\frac{1}{2}$, we can a reference angle $\theta_0=acos(\frac{1}{2})=60^\circ$ and all values in $[0^\circ,360^\circ)$ as $\theta=120^\circ, 240^\circ$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - Chapter 5 Test Prep - Review Exercises - Page 560: 37
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