$$a2+ab,a2-b2,(a+b)2$$
$-2\left(a_{2}-b_{2}\right)\left(a+b\right)\left(ab+a_{2}\right)$
$$2a+2b=2\left(a+b\right)$$
$$-2\left(a_{2}-b_{2}\right)\left(a+b\right)\left(ab+a_{2}\right)$$
$$-2aa_{2}^{2}-2aa_{2}b^{2}+2aa_{2}b_{2}+2ab_{2}b^{2}-2a_{2}ba^{2}+2a_{2}bb_{2}-2ba_{2}^{2}+2bb_{2}a^{2}$$
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$ab+a_{2},a_{2}-b_{2},2\left(a+b\right)$
