Add: (a2+2ab+b2)+(a2−2ab+b2)(a^2 + 2ab + b^2) + (a^2 - 2ab + b^2)(a2+2ab+b2)+(a2−2ab+b2).
2a2+2b22a^2 + 2b^22a2+2b2
2a22a^22a2
4ab4ab4ab
2a2+4ab+2b22a^2 + 4ab + 2b^22a2+4ab+2b2