$$(6 { x }^{ 2 } +6xy+3 { y }^{ 2 } )(6 { x }^{ 2 } -6xy+3 { y }^{ 2 } )$$
$9\left(4x^{4}+y^{4}\right)$
$$36x^{4}+9y^{4}$$
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$36x^{4}+9y^{4}$
