Express x4−1x^4 - 1x4−1 as a product of two or more factors.
(x2−1)(x2+1)(x^2-1)(x^2+1)(x2−1)(x2+1)
(x−1)(x3+x2+x+1)(x-1)(x^3+x^2+x+1)(x−1)(x3+x2+x+1)
(x2+1)2(x^2+1)^2(x2+1)2
(x−1)2(x+1)2(x-1)^2(x+1)^2(x−1)2(x+1)2