$$4 { a }^{ 2 } { b }^{ 2 } -9 { c }^{ 2 }$$
$\left(2ab-3c\right)\left(2ab+3c\right)$
$$\left(2ab-3c\right)\left(2ab+3c\right)$$
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$4\left(ab\right)^{2}-9c^{2}$
