A) \[2{{\tan }^{n}}\frac{A-B}{2}\]
B) \[2{{\cot }^{n}}\frac{A-B}{2}\]
C) \[0\]
D) None of these
Correct Answer: B
Solution :
The expression reduces to \[{{\cot }^{n}}\frac{A-B}{2}+{{\cot }^{n}}\frac{B-A}{2}\] If n is even, answer is (b) and if n is odd answer is (c).
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