The solution of the equation $4\cos^2 x + 6\sin^2 x = 5$ is:

  • A
    $x = n\pi \pm \frac{\pi}{2}$
  • B
    $x = n\pi \pm \frac{\pi}{4}$
  • C
    $x = n\pi \pm \frac{3\pi}{2}$
  • D
    None of these

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