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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_1).f(x_2)=(x_1+x_2)`

B

f(x) is odd

C

`f(x_1)+f(x_2)=f(x_1+x_2/1+x_1x_2)`

D

f(x) is even

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