If $5\cos^2 \theta + 7\sin^2 \theta - 6 = 0$,then the general value of $\theta$ is

  • A
    $2n\pi \pm \frac{\pi}{4}$
  • B
    $n\pi \pm \frac{\pi}{4}$
  • C
    $n\pi + (-1)^n \frac{\pi}{4}$
  • D
    None of these

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