2x−y2x-y2x−y^6 = 12x2x2x^6 + 62x2x2x^5−y-y−y + 152x2x2x^4−y-y−y^2 + 202x2x2x^3−y-y−y^3 + 152x2x2x^2−y-y−y^4 + 62x2x2x−y-y−y^5 + 1−y-y−y^6
= 64x^6 - 192x^5y + 240x^4y^2 - 160x^3y^3 + 60x^2y^4 - 12xy^5 + y^6
2x−y2x-y2x−y^6 = 12x2x2x^6 + 62x2x2x^5−y-y−y + 152x2x2x^4−y-y−y^2 + 202x2x2x^3−y-y−y^3 + 152x2x2x^2−y-y−y^4 + 62x2x2x−y-y−y^5 + 1−y-y−y^6
= 64x^6 - 192x^5y + 240x^4y^2 - 160x^3y^3 + 60x^2y^4 - 12xy^5 + y^6