If \[\tan A-\tan B=x\] and \[\cot B-\cot A=y,\]then \[\cot (A-B)=\]

1.	If \[\tan A-\tan B=x\] and \[\cot B-\cot A=y,\]then \[\cot (A-B)=\]
A.	\[\frac{1}{x}+y\]
B.	\[\frac{1}{xy}\]
C.	\[\frac{1}{x}-\frac{1}{y}\]
D.	\[\frac{1}{x}+\frac{1}{y}\]
Answer» E.

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If \[\tan A-\tan B=x\] and \[\cot B-\cot A=y,\]then \[\cot (A-B)=\]

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