જો $m \cdot \tan (\theta-30^{\circ})=n \cdot \tan (\theta+120^{\circ})$ હોય,તો $\frac{m+n}{m-n}=$

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

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