$$\left. \begin{array} { l } { x ^ { 2 } } \\ { x ^ { 2 } - 2 } \\ { ( x - 1 ) ^ { 2 } - 2 } \end{array} \right.$$
$x^{2}\left(x^{2}-2\right)\left(x^{2}-2x-1\right)$
$$\left(x-1\right)^{2}-2=\left(x-\left(\sqrt{2}+1\right)\right)\left(x-\left(-\sqrt{2}+1\right)\right)$$
$$x^{2}\left(x^{2}-2\right)\left(x^{2}-2x-1\right)$$
$$x^{6}-2x^{5}-3x^{4}+4x^{3}+2x^{2}$$
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$x^{2},\ x^{2}-2,\ \left(x-1\right)^{2}-2$