1. R
2. [-1, 1]
3. [- π/2, π/2]
4. [0, π/2]
[0, π/2]
1. 1
2. e
3. e-1
4. none
1
1. R
2. R-{2}
3. R-{±2}
4. R-{4}
R-{4}
1.
2.
3.
4. abc
1. [1/6, 1/4)
2. (1/6, 1/4]
3. (1/6, 1/4)
4. [1/6, 1/4]
[1/6, 1/4]
1. R-{1}
2. R-{0}
3. R-{(2n+1) π/2:n Z}
4. R-{nπ : n ?Z}
R-{1}
1. (-∞, 1) U (1, ∞)
2. (1, ∞)
3. [0, ∞)
4. R
[0, ∞)
1. (-∞, -5) U [0, ∞)
2. (-∞, 5) U (0, 1)
3. (0, 5) U (1, ∞)
4. none
(-∞, -5) U [0, ∞)
1. (0, ∞)
2. [0, ∞)
3. R
4. R-{3}
[0, ∞)
1. 0
2.
3.
4. does not exist
0