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Which of the following functions have th...

Which of the following functions have the graph symmetrical about the origin? `f(x)gi v e nb ef(x)+f(y)=f((x+y)/(1-x y))` `f(x)gi v e nb yf(x)+f(y)=f(xsqrt(1-y^2)+ysqrt(1-x^2))` `f(x)` given by `f(x+y)=f(x)+f(y)AAx , y in R` none of these

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Find function f(x) which is differentiable and satisfy the relation f(x+y)=f(x)+f(y)+(e^(x)-1)(e^(y)-1)AA x, y in R, and f'(0)=2.