If $\sin 6 \theta + \sin 4 \theta + \sin 2 \theta = 0$, then the general value of $\theta$ is

  • A
    $\frac{n \pi}{4}, n \pi \pm \frac{\pi}{3}$
  • B
    $\frac{n \pi}{4}, n \pi \pm \frac{\pi}{6}$
  • C
    $\frac{n \pi}{4}, 2 n \pi \pm \frac{\pi}{3}$
  • D
    $\frac{n \pi}{4}, 2 n \pi \pm \frac{\pi}{6}$

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