(3x^ny-2xy^2+xy^m+1)*(-2xy)
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(3x^ny-2xy^2+xy^m+1)*(-2xy)
(3x^ny-2xy^2+xy^m+1)*(-2xy)
=-6x^(n+1)y^2+4x^2y^3-2x^2y^(m+2)
(3x^ny-2xy^2+xy^m+1)*(-2xy)
(3x^ny-2xy^2+xy^m+1)*(-2xy)
=-6x^(n+1)y^2+4x^2y^3-2x^2y^(m+2)