Simplify 1−x−11−x−2\frac{1 - x^{-1}}{1 - x^{-2}}1−x−21−x−1.
xx+1\frac{x}{x+1}x+1x
xx−1\frac{x}{x-1}x−1x
1x+1\frac{1}{x+1}x+11
1x−1\frac{1}{x-1}x−11