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if tan^(-1)x+ tan^(-1)y= (4 pi)/(5) then...

if `tan^(-1)x+ tan^(-1)y= (4 pi)/(5)` then `cot^(-1)x+ cot^(-1)y` is equal to

A

`(pi)/(5)`

B

`(3pi)/(5)`

C

`(2pi)/(5)`

D

`pi`

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The correct Answer is:
A
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