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

If `tan^(-1)x+tan^(-1)y=(4pi)/5`, then `cot^(-1)x+cot^(-1)y` equals 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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