A) \[\sin A\]
B) \[\cos A\]
C) \[\tan A\]
D) None of these
Correct Answer: B
Solution :
\[{{\cos }^{2}}\frac{A}{2}-{{\sin }^{2}}\frac{A}{2}=\cos \frac{2A}{2}=\cos A.\]You need to login to perform this action.
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