Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesTrigonometrical ratios of multiple and sub-multiple angles
EasyIf $\tan \frac{\theta}{2} = t$,then $\frac{1 - t^2}{1 + t^2}$ is equal to
- A$\cos \theta$
- B$\sin \theta$
- C$\sec \theta$
- D$\cos 2\theta$
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