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If f(x)=log((1+x)/(1-x)),t h e n f(x1)...

If `f(x)=log((1+x)/(1-x)),t h e n` `f(x_1)f(x)=f(x_1+x_2)` `f(x+2)-2f(x+1)+f(x)=0` `f(x)+f(x+1)=f(x^2+x)` `f(x_1)+f(x_2)=f((x_1+x_2)/(1+x_1x_2))`

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