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