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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

`(2 pi)/(5)`

C

`(3 pi)/(5)`

D

`(4 pi)/(5)`.

Text Solution

Verified by Experts

The correct Answer is:
B
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