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