For example, g(x) = 5x+2, f(x) = 4/(x^2). Then f(g(x)) = 4/[(g(x))^2] = 4/[(5x+2)^2].
Also we always have a trivial solutions f(x) = x and g(x) = h(x) and g(x) = x, f(x) = h(x).
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