$$(2 { x }^{ 2 } +3 { y }^{ 2 } )(4 { x }^{ 4 } -6 { x }^{ 2 } { y }^{ 2 } +9 { y }^{ 4 }$$
$8x^{6}+27y^{6}$
$$2x^{2}\left(4x^{4}-6x^{2}y^{2}\right)+18x^{2}y^{4}+3y^{2}\left(4x^{4}-6x^{2}y^{2}\right)+27y^{6}$$
$$8x^{6}-12x^{4}y^{2}+18x^{2}y^{4}+3y^{2}\left(4x^{4}-6x^{2}y^{2}\right)+27y^{6}$$
$$8x^{6}-12x^{4}y^{2}+18x^{2}y^{4}+12y^{2}x^{4}-18y^{4}x^{2}+27y^{6}$$
$$8x^{6}+18x^{2}y^{4}-18y^{4}x^{2}+27y^{6}$$
$$8x^{6}+27y^{6}$$
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