If f(x)=log[(1+x)/(1-x)], then prove tha...

If `f(x)=log[(1+x)/(1-x)],` then prove that `f[(2x)/(1+x^2)]=2f(x)dot`

A

`[f(x)]^2`

B

`[f(x)]^3`

C

2f(x)

D

3f(x)

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The correct Answer is:

C

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