Simplify: fracx4−1x2+1\\frac{x^4-1}{x^2+1}fracx4−1x2+1 (assume x2≠−1x^2 \neq -1x2=−1).
x2−1x^2 - 1x2−1
x2+1x^2 + 1x2+1
(x−1)(x+1)(x-1)(x+1)(x−1)(x+1)
x4−2x^4-2x4−2