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If tanA-tanB=x and cotB-cotA=y, then cot...

If `tanA-tanB=x and cotB-cotA=y`, then `cot(A-B)=?`

A

`1/x-1/y`

B

`1/y-1/x`

C

`(xy)/(x+y)`

D

`1+(1)/(xy)`

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The correct Answer is:
A
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