Expand: (a−b)2(a - b)^2(a−b)2.
a2−b2a^2 - b^2a2−b2
a2+2ab+b2a^2 + 2ab + b^2a2+2ab+b2
a2−2ab+b2a^2 - 2ab + b^2a2−2ab+b2
a2−ab+b2a^2 - ab + b^2a2−ab+b2