$$(3x- { x }^{ 3 } +3)( { x }^{ 2 } -3x+1)$$
$\left(x^{2}-3x+1\right)\left(3+3x-x^{3}\right)$
$$2x^{3}-6x^{2}-6x-x^{5}+3x^{4}+3$$
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$3-6x-6x^{2}+2x^{3}+3x^{4}-x^{5}$