Solve x2−4x2−1>0\frac{x^2 - 4}{x^2 - 1} > 0x2−1x2−4>0.
(−∞,−2)∪(−1,1)∪(2,∞)(-\infty, -2) \cup (-1, 1) \cup (2, \infty)(−∞,−2)∪(−1,1)∪(2,∞)
(−∞,−1)∪(1,2)(-\infty, -1) \cup (1, 2)(−∞,−1)∪(1,2)
(−2,−1)∪(1,2)(-2, -1) \cup (1, 2)(−2,−1)∪(1,2)
(−∞,−2)∪(2,∞)(-\infty, -2) \cup (2, \infty)(−∞,−2)∪(2,∞)