Q 1502556438.     If `f(x) = In ((1+x)/(1-x)),` then

A

`f(x_1 ) · f(x_2 ) = f(x_1 + x_2)`

B

`f(x + 2)- 2f(x + 1) + f(x) = 0`

C

`f(x) + f(x + 1) = f(x2 + x)`

D

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

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