A function f: R -> R satisfies the equat...

A function `f: R -> R` satisfies the equation `f(x)f(y)-f(x y)=x+yAAx ,y in Ra n df(1)>0` , then
a. `f(x)f^(-1)(x)=x^2-4` b. `f(x)f^(-1)(x)=x^2-6`
c. `f(x)f^(-1)(x)=x^2-1` d. none of these

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