$$(4x-3 { x }^{ 3 } +2 { x }^{ 2 } -1)(4x+2 { x }^{ 2 } +3)$$
$\left(x+1\right)\left(-3x^{2}+5x-1\right)\left(2x^{2}+4x+3\right)$
$$20x^{2}+7x^{3}+8x-8x^{4}-6x^{5}-3$$
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$-6x^{5}-8x^{4}+7x^{3}+20x^{2}+8x-3$
