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