જો $\tan \frac{\theta}{2} = \operatorname{cosec} \theta - \sin \theta$ હોય,તો $\tan^2 \frac{\theta}{2} =$

  • A
    $2 - \sqrt{5}$
  • B
    $-2 + \sqrt{5}$
  • C
    $2 + \sqrt{5}$
  • D
    $\sqrt{2} + 5$

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