`(x^2-4)sqrt(x^2 -1) lt 0.` We must have `x^2- 1 ge 0 ` or `x^2 ge 1` or `x le - 1 or x ge 1` Also `(x^2-4)sqrt(x^2-1) lt 0` or `x^2-4 gt 0` or `x^2 lt 4` Or `-2 lt x lt 2` From (1) and (2) we have `x in (-2, -1] cup [1,2)`
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