Simplify: x2−1(x−1)2\frac{x^2 - 1}{(x-1)^2}(x−1)2x2−1 for x≠1x \neq 1x=1.
x+1x+1x+1
1x−1\frac{1}{x-1}x−11
x−1x-1x−1
x+1x−1\frac{x+1}{x-1}x−1x+1