trigonometry

Question: If $\tan \frac{\theta }{2}=t,$then $\frac{1-{{t}^{2}}}{1+{{t}^{2}}}$is equal to

1) $\cos \theta $

2) $\sin \theta $

3) $\sec \theta $

4) $\cos 2\theta $

Solution:

Explanation: No Solution

Trigonometric ratios of multiple and sub-multiple angles

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