If \[\cos A=m\cos B,\]then [MNR 1990]

1.	If \[\cos A=m\cos B,\]then [MNR 1990]
A.	\[\cot \frac{A+B}{2}=\frac{m+1}{m-1}\tan \frac{B-A}{2}\]
B.	\[\tan \frac{A+B}{2}=\frac{m+1}{m-1}\cot \frac{B-A}{2}\]
C.	\[\cot \frac{A+B}{2}=\frac{m+1}{m-1}\tan \frac{A-B}{2}\]
D.	None of these
Answer» B. \[\tan \frac{A+B}{2}=\frac{m+1}{m-1}\cot \frac{B-A}{2}\]

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If \[\cos A=m\cos B,\]then [MNR 1990]

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