x^3+3x^2y+3xy^2+y^3-(x^3-3x^2y+3xy^2-y^3)=x^3+3x^2y+3xy^2+y^3-x3+3x^2y-3xy^2+y^3=6x^2y+2y^3
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x^3+3x^2y+3xy^2+y^3-(x^3-3x^2y+3xy^2-y^3)=x^3+3x^2y+3xy^2+y^3-x3+3x^2y-3xy^2+y^3=6x^2y+2y^3