$$10x^{2}-3xy+4y^{2},2x^{2}+2xy-6y^{2})-3x^{2}-5y^{2}+8xy$$
$2\left(3x^{2}+5y^{2}-8y\right)\left(29\left(xy\right)^{2}-7yx^{3}+12y^{4}-13xy^{3}-10x^{4}\right)$
$$2x^{2}+2xy-6y^{2}=2\left(x^{2}+xy-3y^{2}\right)$$
$$2\left(3x^{2}+5y^{2}-8y\right)\left(-10x^{4}+29x^{2}y^{2}-13xy^{3}+12y^{4}-7yx^{3}\right)$$
$$-60x^{6}-148x^{3}y^{3}+362x^{2}y^{4}-464x^{2}y^{3}-130xy^{5}+208xy^{4}+120y^{6}-192y^{5}+74y^{2}x^{4}+112y^{2}x^{3}-42yx^{5}+160yx^{4}$$
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$10x^{2}-3xy+4y^{2},2\left(x^{2}+xy-3y^{2}\right),8y-5y^{2}-3x^{2}$
