−2<x<2-2<x<2−2<x<2
−2≤x<2-2 \leq x<2−2≤x<2
−2≤x≤2-2 \leq x \leq 2−2≤x≤2
−2<x≤2-2<x \leq 2−2<x≤2
−∞≤x≤∞-\infty \leq x \leq \infty−∞≤x≤∞