(a) f(g(x)) = 3/(g(x)) = 3/(-3/x) = -x,
g(f(x)) = -3/(f(x)) = -3/(3/x) = -x.
Not inverse, for inverse the result must be x.
(b) f(g(x)) = g(x)+2 = (x-2)+2 = x,
g(f(x)) = f(x) - 2 = (x+2)-2 = x.
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