$$x^{2}-y^{2}; x^{2}-4xy+4y^{2}$$
$-\left(x-2y\right)^{2}\left(x^{2}-y^{2}\right)$
$$-\left(x-y\right)\left(x+y\right)\left(x-2y\right)^{2}$$
$$-x^{4}-3x^{2}y^{2}-4xy^{3}+4y^{4}+4yx^{3}$$
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$x^{2}-y^{2},\ \left(x-2y\right)^{2}$
