The general solution of $\frac{1-\cos 2x}{1+\cos 2x}=3$ is
- A$x=2n\pi \pm \frac{\pi}{3}, n \in Z$
- B$x=n\pi \pm \frac{\pi}{6}, n \in Z$
- C$x=2n\pi \pm \frac{\pi}{6}, n \in Z$
- D$x=n\pi \pm \frac{\pi}{3}, n \in Z$
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