Answer
$ \frac{\pi}{3}, \frac{5\pi}{3}$
Work Step by Step
Step 1. $cos\theta=\frac{1}{2} \longrightarrow \theta=2k\pi+\frac{\pi}{3}$ and $\theta=2k\pi+\frac{5\pi}{3}$
Step 2. Within $[0,2\pi)$, we have $\theta= \frac{\pi}{3}, \frac{5\pi}{3}$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - Chapter Review - Review Exercises - Page 507: 64
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