Solve $\cos x = \frac{1}{2}$
- A$x = 2n\pi \pm \frac{\pi}{3}, n \in Z$
- B$x = n\pi \pm \frac{\pi}{3}, n \in Z$
- C$x = 2n\pi + \frac{\pi}{3}, n \in Z$
- D$x = n\pi + \frac{\pi}{3}, n \in Z$
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