The principal solutions of $\cos 2x = -\frac{1}{2}$ are
- A$x = \frac{\pi}{3}, x = \frac{2\pi}{3}$
- B$x = \frac{\pi}{3}, x = \frac{5\pi}{6}$
- C$x = \frac{2\pi}{3}, x = \frac{4\pi}{3}$
- D$x = \frac{\pi}{6}, x = \frac{5\pi}{6}$
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