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