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