(2х^2- ху+у^2)-(х^2-2ху-у^2) упростить

(2х^2- ху+у^2)-(х^2-2ху-у^2) 2x^2-xy+y^2-x^2+2xy+y^2 2x^2-1xy+1y^2-1x^2+2xy+1y^2 (2-1)x^2+(-1+2)xy+(1+1)y^2 1x^2+1xy+2y^2 x^2+xy+2y^2