$\frac{\sin 3\theta + \sin 5\theta + \sin 7\theta + \sin 9\theta}{\cos 3\theta + \cos 5\theta + \cos 7\theta + \cos 9\theta} = $

  • A
    $\tan 3\theta$
  • B
    $\cot 3\theta$
  • C
    $\tan 6\theta$
  • D
    $\cot 6\theta$

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