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f(x)+f(y)=f((x+y)/(1-xy)) ,for allx,yinR...

`f(x)+f(y)=f((x+y)/(1-xy))` ,for all`x,yinR`.`(xy!=1)`,and `lim_(x->0) f(x)/x=2`.Find`f(sqrt3)`and `f'(-2)`.

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