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

  • A

    $\sin \frac{A}{2}$

  • B

    $\cos \frac{A}{2}$

  • C

    $\tan \frac{A}{2}$

  • D

    $\cot \frac{A}{2}$

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