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"If "f(x)+f(y)=f((x+y)/(1-xy))" for all ...

`"If "f(x)+f(y)=f((x+y)/(1-xy))" for all "x,y in R, (xyne1), and lim_(xrarr0) (f(x))/(x)=2" then find "f((1)/(sqrt(3))) and f'(1).`

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