Find the domain of f(x)=x2−1x2−4f(x) = \sqrt{\frac{x^2-1}{x^2-4}}f(x)=x2−4x2−1.
(−∞,−2)∪[−1,1]∪(2,∞)(-\infty, -2) \cup [-1, 1] \cup (2, \infty)(−∞,−2)∪[−1,1]∪(2,∞)
(−2,−1]∪[1,2)(-2, -1] \cup [1, 2)(−2,−1]∪[1,2)
(−∞,−1]∪[1,∞)(-\infty, -1] \cup [1, \infty)(−∞,−1]∪[1,∞)
(−2,2)(-2, 2)(−2,2)