MCQ
$\sqrt {\frac{{1 - \sin A}}{{1 + \sin A}}} = $
- A$\sec A + \tan A$
- B$\tan \left( {\frac{\pi }{4} - A} \right)$
- C$\tan \left( {\frac{\pi }{4} + \frac{A}{2}} \right)$
- ✓$\tan \left( {\frac{\pi }{4} - \frac{A}{2}} \right)$
$ = \sqrt {\frac{{2{{\sin }^2}\left( {\frac{\pi }{4} - \frac{A}{2}} \right)}}{{2{{\cos }^2}\left( {\frac{\pi }{4} - \frac{A}{2}} \right)}}} = \tan \left( {\frac{\pi }{4} - \frac{A}{2}} \right)$.
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