Simplify: (x+1)3−x3(x+1)^3 - x^3(x+1)3−x3.
3x2+3x+13x^2 + 3x + 13x2+3x+1
1
x3+3x2+3x+1x^3 + 3x^2 + 3x + 1x3+3x2+3x+1
3x2+13x^2 + 13x2+1