If $\sin 6\theta = 32\cos^5 \theta \sin \theta - 32\cos^3 \theta \sin \theta + 3x,$ then $x = $

  • A
    $\cos \theta$
  • B
    $\cos 2\theta$
  • C
    $\sin \theta$
  • D
    $\sin 2\theta$

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