There exists a positive real number x sa...

There exists a positive real number x satisfying
`cos ( tan^(-1)x) = x`. The number value of `cos^(-1) (x^(2)/2)` is

A

`pi/10`

B

`pi/5`

C

`(2pi)/5`

D

`(4pi)/5`

Verified by Experts

The correct Answer is:

C

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