$\frac{\sin A+\sin 7 A+\sin 13 A}{\cos A+\cos 7 A+\cos 13 A} =$

  • A
    $\cot 7 A$
  • B
    $\tan 6 A$
  • C
    $\tan 7 A$
  • D
    $\cot 6 A$

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