If f(x) = log { (1+x) / (1-x) } , f(x) + f(y) is

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✪ Choose the correct option.

If f(x) = log { (1+x) / (1-x) } , f(x) + f(y) is

A. f(x+y)
B. f{(x+ y) /(1 + xy) }
C. (x+ y) f { 1 /(1 + xy) }
D. ( f(x) + f(y) ) / ( 1 + xy )

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