Answer
$\frac{\pi}{3},\frac{5\pi}{3}$
Work Step by Step
1. $cos\theta=\frac{1}{2}$, we have $\theta=2k\pi+\frac{\pi}{3}$ or $\theta=2k\pi+\frac{5\pi}{3}$
2. Within $[0,2\pi)$, we have $\theta=\frac{\pi}{3},\frac{5\pi}{3}$
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