Find the partial fraction decomposition of 1x2−1\frac{1}{x^2 - 1}x2−11.
\frac{1}{2(x-1)} - \frac{1}{2(x+1)}
\frac{1}{x-1} + \frac{1}{x+1}
\frac{1}{x-1} - \frac{1}{x+1}
\frac{1}{2(x-1)} + \frac{1}{2(x+1)}