(3x²-y²)×(2²y-yz²-zx²)
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=3x^2(4y-yz^2-zx^2)-y^2(4y-yz^2-zx^2)
=12x^2y-3x^2yz^2-3x^4z-4y^3+y^3z^2+zx^2y^2
=12x^2y-3x^2yz^2-3x^4z-4y^3+y^3z^2+zx^2y^2
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