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

  • A
    $n\pi + \frac{\pi}{4}$
  • B
    $n\pi - \frac{\pi}{4}$
  • C
    $n\pi \pm \frac{\pi}{4}$
  • D
    $2n\pi \pm \frac{\pi}{4}$

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