Simplify: x2+2x−3x2−1\frac{x^2 + 2x - 3}{x^2 - 1}x2−1x2+2x−3 (assume x≠±1x \neq \pm 1x=±1).
x+3x+1\frac{x+3}{x+1}x+1x+3
x−1x+1\frac{x-1}{x+1}x+1x−1
x+3x−1\frac{x+3}{x-1}x−1x+3
x+3x + 3x+3