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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

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