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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