Simplify: (1+x)(1+x2)(1+x4)(1 + x)(1 + x^2)(1 + x^4)(1+x)(1+x2)(1+x4) for x≠1x \neq 1x=1.
1−x81−x\frac{1 - x^8}{1 - x}1−x1−x8
1+x+x2+x41 + x + x^2 + x^41+x+x2+x4
x8−1x−1\frac{x^8 - 1}{x - 1}x−1x8−1
1−x81 - x^81−x8