If $\sin 6\theta + \sin 4\theta + \sin 2\theta = 0$,then $\theta = $

  • A
    $\frac{n\pi}{4}$ or $n\pi \pm \frac{\pi}{3}$
  • B
    $\frac{n\pi}{4}$ or $n\pi \pm \frac{\pi}{6}$
  • C
    $\frac{n\pi}{4}$ or $2n\pi \pm \frac{\pi}{6}$
  • D
    None of these

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