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