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