Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
Easy$\tan \frac{A}{2}$ is equal to
- A$\pm \sqrt{\frac{1 - \sin A}{1 + \sin A}}$
- B$\pm \sqrt{\frac{1 + \sin A}{1 - \sin A}}$
- C$\pm \sqrt{\frac{1 - \cos A}{1 + \cos A}}$
- D$\pm \sqrt{\frac{1 + \cos A}{1 - \cos A}}$
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