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f(x) = 2x; g(x) = 3x^2 + 1
(f x g)(4) is 2x(3x^2 + 1)
2x(3x^2 + 1)
6x^3 + 2x
6(4)^3 + 2(4)
6(64) + 8
384 + 8
392
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