1. (-∞, 0) U (0, 5) U (5, ∞)
2. (-∞, 0) U (0, 1) U (1, ∞)
3. (-∞, 0) U (0, ∞)
4. (-∞, 1) U (1, ∞)
(-∞, 0) U (0, 1) U (1, ∞)
1. [-2, 2]
2. [-5, 5]
3. [-1, 4]
4. [-1, 5]
[-1, 4]
1. [-2, 2]
2. (-2, 2)
3. [-2, 0) U (0, 2]
4. R-{0}
[-2, 0) U (0, 2]
1. [-3, 3]
2. (-3, 0) U (0, 3)
3. [-3, 0) U (0, 3]
4. R
[-3, 0) U (0, 3]
1. (2, 3)
2. [2, 3)
3. (2, ∞)
4. (-∞, 3)
(2, 3)
1. {x: 2nπ-π/2 < x< 2nπ+ π/2, n Z}
2. {x: 2nπ< x
3. {x: x? (-∞, ∞)}
4. none
{x: 2nπ-π/2 < x< 2nπ+ π/2, n Z}
1. 1:2:3
2. 2:1:3
3. 3:2:1
4. 1:3:2
1:2:3
1. {x: 2nπ-π/2 < x< 2nπ+ π/2, n Z}
2. {x: 2nπ< x< 2nπ+ π, n ? Z}
3. {x: 2nπ< x< 2nπ+3π/2, n ? Z}
4. R
{x: 2nπ< x< 2nπ+ π, n ? Z}
1. [-2, -1]
2. [1, 2]
3. [-2, -1] U [1, 2]
4. (0, ∞)
[-2, -1] U [1, 2]