\[\frac{x^{2} - 1}{x^{2} - 4} \cdot \frac{5x + 10}{x + 1} =\]
\[= \frac{(x - 1)(x + 1) \cdot 5(x + 2)}{(x - 2)(x + 2)(x + 1)} =\]
\[= \frac{5x - 5}{x - 2}.\]