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If tan^(-1) x =pi/10 for some "x"in R ,...

If `tan^(-1) x =pi/10` for some `"x"in R` , then the value of `cot^(-1)` x is

A

`pi/5`

B

`(2pi)/5`

C

`(3pi)/5`

D

`(4pi)/5`

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