A) \[\cos \theta \]
B) \[\sin \theta \]
C) \[\sec \theta \]
D) \[\cos 2\theta \]
Correct Answer: A
Solution :
\[\tan \frac{\theta }{2}=t\Rightarrow \frac{1-{{\tan }^{2}}\frac{\theta }{2}}{1+{{\tan }^{2}}\frac{\theta }{2}}=\cos \theta \].
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