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If cos A = m cos B, then cot((A+B)/2)cot((B-A)/2) =

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If cos A = m cos B, then cot((A+B)/2)cot((B-A)/2) =

cot\(\frac{A+B}{2}\)cot\(\frac{B-A}{2}\)

A. \(\frac{m-1}{m+1}\)

B. \(\frac{m+2}{m-2}\)

C. \(\frac{m+1}{m-1}\)

D. None of these

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Option : (C)

cot((A+B)/2)cot((B-A)/2)

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