$$\frac{ { a }^{ 3 } - { b }^{ 3 } }{ a-b }$$
$a^{2}+ab+b^{2}$
$$\frac{\left(a-b\right)\left(a^{2}+ab+b^{2}\right)}{a-b}$$
$$a^{2}+ab+b^{2}$$
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