If tan A - tan B = x and cot B - cot A = y, then cot (A - B) is equal – McqOptions

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1.	If tan A - tan B = x and cot B - cot A = y, then cot (A - B) is equal to
A.	\(\dfrac{1}{x}+\dfrac{1}{y}\)
B.	\(\dfrac{1}{x}-\dfrac{1}{y}\)
C.	\(-\dfrac{1}{x}+\dfrac{1}{y}\)
D.	\(-\dfrac{1}{x}-\dfrac{1}{y}\)
Answer» B. \(\dfrac{1}{x}-\dfrac{1}{y}\)

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