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