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If cot^(-1)x=(2pi)/5 for some x in R , t...

If `cot^(-1)x=(2pi)/5` for some `x in R` , the value of `tan^(-1)` x is ........

A

`-pi/10`

B

`pi/5`

C

`pi/10`

D

`-pi/5`

Text Solution

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