$$2x^{2}-y^{2}+x^{2}+3,y^{2}-2a-3b$$
$\left(3b+2a-y^{2}\right)\left(-3x^{2}+y^{2}-3\right)$
$$\left(3b+2a-y^{2}\right)\left(-3x^{2}+y^{2}-3\right)$$
$$3x^{2}y^{2}-9bx^{2}-6ax^{2}-y^{4}+2ay^{2}+3by^{2}+3y^{2}-9b-6a$$
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$3x^{2}-y^{2}+3,y^{2}-2a-3b$
