$4 \cos \frac{7 \theta}{2} \cos \frac{3 \theta}{2} \sin 5 \theta = $

  • A
    $\sin 10 \theta + \sin 7 \theta - \sin 3 \theta$
  • B
    $\sin 10 \theta + \sin 7 \theta - \sin 5 \theta$
  • C
    $\sin 10 \theta + \sin 7 \theta + \sin 3 \theta$
  • D
    $\sin 10 \theta + \sin 7 \theta + \sin 5 \theta$

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