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Let f(x)= cos^(-1) ((1-x^2)/(1+x^2))= 2 ...

Let `f(x)= cos^(-1) ((1-x^2)/(1+x^2))= 2 tan^(-1)x x ge 0 , =-2 tan^(-1)x x gt 0` function fx) is continuous everywhere but not differentiable at x equals to

A

1

B

`-1`

C

0

D

`1/sqrt 2`

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The correct Answer is:
C
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