If $\tan 2\theta \tan \theta = 1$,then the general value of $\theta$ is

  • A
    $\left( n + \frac{1}{2} \right) \frac{\pi}{3}$
  • B
    $\left( n + \frac{1}{2} \right) \pi$
  • C
    $\left( 2n \pm \frac{1}{2} \right) \frac{\pi}{3}$
  • D
    None of these

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