Find the general solution of $3 \sin^4(\theta) + \cos^4(\theta) = 1$.

  • A
    $n\pi$ only
  • B
    $n\pi + \frac{\pi}{4}$ only
  • C
    $n\pi - \frac{\pi}{4}$ only
  • D
    $n\pi, n\pi + \frac{\pi}{4}, n\pi - \frac{\pi}{4}$

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