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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

`(2pi)/5`

C

`(3pi)/5`

D

`pi`

Text Solution

Verified by Experts

The correct Answer is:
A
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