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If tan A - tan B = x and cot A - cot B =...

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

A

`(xy)/(x+y)`

B

`(xy)/(x-y)`

C

`(x-y)/(xy)`

D

`(y-x)/(xy)`

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The correct Answer is:
D
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