Find the principal value of each of the following:
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4. Inverse Trigonometric Functions
1
1
1
1
1
1
2
2
3
3
3
3
4
5
1
2
3
4
4
4
4
5
5
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5
1
1
1
1
2
2
3
3
3
1
1
1
1
2
2
3
3
1
1
1
1
1
2
3
3
3
3
1
1
1
1
2
3
3
3
3
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
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4
4
4
4
4
4
4
5
5
5
5
5
5
6
6
6
6
6
6
7
7
7
7
7
7
7
7
7
7
1
1
1
1
1
1
1
1
1
2
2
2
2
3
4
1
1
1
2
2
2
3
1
1
1
1
1
2
3
4
5
6
7
8
9
10
1
1
1
2
3
3
3
3
3
3
3
3
3
3
4
1
2
2
2
3
3
1
2
3
4
1
1
1
1
2
2
2
2
2
2
2
2
2
2
3
4
4
5
6
7
7
8
8
8
8
8
8
9
10
11
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5
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15
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17
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30
31
32
33
34
35
1
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60
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