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