Find the domain of f(x)=2−x2−1f(x) = \sqrt{2 - \sqrt{x^2-1}}f(x)=2−x2−1.
[−5,−1]∪[1,5][- \sqrt{5}, -1] \cup [1, \sqrt{5}][−5,−1]∪[1,5]
[−3,3][- \sqrt{3}, \sqrt{3}][−3,3]
[−2,2][-2, 2][−2,2]
[1,∞)[1, \infty)[1,∞)