$${ \left(x+2y \right) }^{ 2 } -16 { z }^{ 2 }$$
$x^{2}+4xy+4y^{2}-16z^{2}$
$$x^{2}+4xy+4y^{2}-16z^{2}$$
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$\left(x+2y\right)^{2}-16z^{2}$
