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If f(x) = log [(1+x)/(1-x)] then f [(2x)...

If f(x) = log `[(1+x)/(1-x)]` then f `[(2x)/(1+x^2)]` is equal to

A

`[f(x)]^2`

B

`[f(x)]^3`

C

2f(x)

D

3f(x)

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