જો $\frac{{5\pi }}{2} < x < 3\pi $,હોય તો $\frac{{\sqrt {1 - \sin x} + \sqrt {1 + \sin x} }}{{\sqrt {1 - \sin x} - \sqrt {1 + \sin x} }}$ =
જો $\frac{{5\pi }}{2} < x < 3\pi $,હોય તો $\frac{{\sqrt {1 - \sin x} + \sqrt {1 + \sin x} }}{{\sqrt {1 - \sin x} - \sqrt {1 + \sin x} }}$ =
- A
$-cot \frac{x}{2}$
- B
$cot \frac{x}{2}$
- C
$ tan \frac{x}{2}$
- D
$-tan \frac{x}{2}$
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- [IIT 1980]
$cos^273^o + cos^247^o + (cos73^o . cos47^o )$ =
$cos^273^o + cos^247^o + (cos73^o . cos47^o )$ =
જો $2\tan A = 3\tan B,$ તો $\frac{{\sin 2B}}{{5 - \cos 2B}} = . . . .$
જો $2\tan A = 3\tan B,$ તો $\frac{{\sin 2B}}{{5 - \cos 2B}} = . . . .$
$\sin {163^o}\cos {347^o} + \sin {73^o}\sin {167^o} = $
$\sin {163^o}\cos {347^o} + \sin {73^o}\sin {167^o} = $