यदि $m \tan (\theta - 30^\circ) = n \tan (\theta + 120^\circ)$ है,तो $\frac{m + n}{m - n} = $

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

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