$$4 { x }^{ 2 } -81 { y }^{ 4 }$$
$\left(2x-9y^{2}\right)\left(2x+9y^{2}\right)$
$$\left(2x-9y^{2}\right)\left(2x+9y^{2}\right)$$
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$4x^{2}-81y^{4}$