multiply 3xy2 + 4x2 ; xy - 3x2
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3x2y3−9x3y2+4x3y−12x4
(3xy2+4x2)(xy−3x2)
=3xy2(xy−3x2)+4x2(xy−3x2)
=3x2y3−9x3y2+4x3y−12x4
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