Divide x4−1x^4 - 1x4−1 by x2−1x^2 - 1x2−1.
x2+1x^2 + 1x2+1
x2−1x^2 - 1x2−1
x2+1x^2 + 1x2+1 with remainder 2
x3+1x^3 + 1x3+1