Simplify: (x+y)2+(x−y)2(x+y)^2 + (x-y)^2(x+y)2+(x−y)2.
2x2+2y22x^2 + 2y^22x2+2y2
2x2−2y22x^2 - 2y^22x2−2y2
4xy4xy4xy
2x22x^22x2