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There exists a positive real number of `x` satisfying `"cos"(tan^(-1)x)=xdot` Then the value of `cos^(-1)((x^2)/2)i s` `pi/(10)` (b) `pi/5` (c) `(2pi)/5` (d) `(4pi)/5`

A

`pi/10`

B

`pi/5`

C

`(2pi)/5`

D

`(4pi)/5`

Text Solution

Verified by Experts

The correct Answer is:
C
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