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