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

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

A

`pi`

B

`pi/5`

C

`(2pi)/5`

D

`(3pi)/5`

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