(2, 3)
(−∞,2)∪(3,+∞)(-\infty, 2 )\cup(3, +\infty)(−∞,2)∪(3,+∞)
(−∞,0)∪(1,+∞)(-\infty, 0 )\cup(1, +\infty)(−∞,0)∪(1,+∞)
(−∞,+∞)(-\infty, +\infty)(−∞,+∞)