જો $a = \cos \theta + i \sin \theta$ હોય,તો $\frac{1 + a}{1 - a} = $

  • A
    $\cot \theta$
  • B
    $\cot \frac{\theta}{2}$
  • C
    $i \cot \frac{\theta}{2}$
  • D
    $i \tan \frac{\theta}{2}$

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