Find the range of f(x)=x2+1x2−1f(x) = \frac{x^2+1}{x^2-1}f(x)=x2−1x2+1.
y≤−1y \leq -1y≤−1 or y>1y > 1y>1
y<−1y < -1y<−1 or y≥1y \geq 1y≥1
y<0y < 0y<0 or y>1y > 1y>1
All real numbers