$\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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