Multiply: (x2−1)(x2+1)(x^2 - 1)(x^2 + 1)(x2−1)(x2+1).
x4−1x^4 - 1x4−1
x4+1x^4 + 1x4+1
x4−2x2+1x^4 - 2x^2 + 1x4−2x2+1
x4−x2−1x^4 - x^2 - 1x4−x2−1