представьте в виде произведения
4ab-b^3-8a^2+2ab^2
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4AB - B^3 - 8A^2 + 2AB^2 = B * ( 4A - B^2) + 2A * ( - 4A + B^2 ) == - B * ( - 4A + B^2 ) + 2A * ( - 4A + B^2 ) =
= ( 2A - B) * ( B^2 - 4A )