$$4 { x }^{ 2 } +3 { y }^{ 2 } +4xy,5 { x }^{ 2 } +8 { y }^{ 2 } +12xy$$
$20x^{4}+68xy^{3}+24y^{4}+68yx^{3}+95\left(xy\right)^{2}$
$$20x^{4}+95x^{2}y^{2}+68xy^{3}+24y^{4}+68yx^{3}$$
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$4x^{2}+4xy+3y^{2},5x^{2}+12xy+8y^{2}$
