$\frac{1 + \sin A - \cos A}{1 + \sin A + \cos A} = $

  • A
    $\sin \frac{A}{2}$
  • B
    $\cos \frac{A}{2}$
  • C
    $\tan \frac{A}{2}$
  • D
    $\cot \frac{A}{2}$

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