"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 underset(xrarr0)lim(f(x))/(x)=2" then find "f((1)/(sqrt(3))) and f'(1).`

A

`f(sqrt(3))=(2pi)/3`

B

`f(sqrt(3))=(pi)/3`

C

`f'(-2)=2/5`

D

`f'(-2)=1/5`

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The correct Answer is:

A, C

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