If $\frac{1 - \cos 2\theta}{1 + \cos 2\theta} = 3$,then the general value of $\theta$ is

  • A
    $2n\pi \pm \frac{\pi}{6}$
  • B
    $n\pi \pm \frac{\pi}{6}$
  • C
    $2n\pi \pm \frac{\pi}{3}$
  • D
    $n\pi \pm \frac{\pi}{3}$

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