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જોtan^-1 x+tan^-1 y=(4 pi)/5 તો cot^-1 x...

જો`tan^-1 x+tan^-1 y=(4 pi)/5` તો `cot^-1 x+cot^-1 y =`_______

A

`pi/5`

B

`(2pi)/5`

C

`(3pi)/5`

D

`pi`

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