Find the value of x4−1x3+x2+x+1\frac{x^4 - 1}{x^3 + x^2 + x + 1}x3+x2+x+1x4−1 when x≠−1x \neq -1x=−1 and x≠1x \neq 1x=1.
x−1x - 1x−1
x+1x + 1x+1
x2−1x^2 - 1x2−1
x2+1x^2 + 1x2+1