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

  • A
    $\sec A + \tan A$
  • B
    $\tan \left( \frac{\pi}{4} - A \right)$
  • C
    $\tan \left( \frac{\pi}{4} + \frac{A}{2} \right)$
  • D
    $\tan \left( \frac{\pi}{4} - \frac{A}{2} \right)$

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