Simplify the expression: (x+1)2−(x−1)2(x+1)^2 - (x-1)^2(x+1)2−(x−1)2.
4x4x4x
2x2+22x^2 + 22x2+2
222
x2+2x+1x^2 + 2x + 1x2+2x+1