$$x(x+y)+y(x+y)$$
$\left(x+y\right)^{2}$
$$x^{2}+xy+y\left(x+y\right)$$
$$x^{2}+xy+yx+y^{2}$$
$$x^{2}+2xy+y^{2}$$
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$x^{2}+2xy+y^{2}$