Which of the following functions have th...

Which of the following functions have the graph symmetrical about the origin? (a) `f(x)` given by `f(x)+f(y)=f((x+y)/(1-x y))` (b) `f(x)` given by `f(x)+f(y)=f(xsqrt(1-y^2)+ysqrt(1-x^2))` (c) `f(x)` given by `f(x+y)=f(x)+f(y)AAx , y in R` (d) none of these

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