For which function is f(x) equal to f^-1(x)
Af(x)=x+6/x-6
Bf(x)=x+2/x-2
Cf(x)=x+1/x-1
Df(x)=x+5/x+5
Af(x)=x+6/x-6
Bf(x)=x+2/x-2
Cf(x)=x+1/x-1
Df(x)=x+5/x+5