$$(a+b)^{2}-(a-b)^{2}$$
$4ab$
$$a^{2}+2ab+b^{2}-\left(a-b\right)^{2}$$
$$a^{2}+2ab+b^{2}-\left(a^{2}-2ab+b^{2}\right)$$
$$a^{2}+2ab+b^{2}-a^{2}+2ab-b^{2}$$
$$2ab+b^{2}+2ab-b^{2}$$
$$4ab+b^{2}-b^{2}$$
$$4ab$$
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