$$a^{3}-2a^{2}b; +b^{3}+4a^{3}; +2ab^{2}$$
$2\left(2b-a\right)\left(4a^{3}+b^{3}\right)\left(ab\right)^{2}$
$$2\left(2b-a\right)a^{2}b^{2}\left(4a^{3}+b^{3}\right)$$
$$-2a^{3}b^{5}+4a^{2}b^{6}+16b^{3}a^{5}-8b^{2}a^{6}$$
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$\left(a-2b\right)a^{2},\ 4a^{3}+b^{3},\ 2ab^{2}$
