Simplify the complex fraction: xx+1x2x2−1\dfrac{\dfrac{x}{x+1}}{\dfrac{x^2}{x^2-1}}x2−1x2x+1x.
x−1x\dfrac{x - 1}{x}xx−1
x+1x\dfrac{x + 1}{x}xx+1
x−1x+1\dfrac{x - 1}{x + 1}x+1x−1
x−1x - 1x−1