Expand and simplify: (x+1)(x−1)(x2+1)(x + 1)(x - 1)(x^2 + 1)(x+1)(x−1)(x2+1).
x4−1x^4 - 1x4−1
x4+1x^4 + 1x4+1
x4−2x2+1x^4 - 2x^2 + 1x4−2x2+1
x4+2x2−1x^4 + 2x^2 - 1x4+2x2−1