x – y
x + y
(x2−y2)(x3+y3)(x^2 − y^2) (x^3 + y^3) (x2−y2)(x3+y3)
(x−y)(x+y)2(x2−xy+y2)(x − y) (x + y)^2 (x^2 − xy + y^2)(x−y)(x+y)2(x2−xy+y2)
