x 余弦值 | x = arccos(y) 反余弦值 | |
---|---|---|
角度 | 弧度 | |
-1 |
180° |
π |
-0.8660254 |
150° |
5π 6 |
-0.7071068 |
135° |
3π 4 |
-0.5 |
120° |
2π 3 |
0 |
90° |
π 2 |
0.5 |
60° |
π 3 |
0.7071068 |
45° |
π 4 |
0.8660254 |
30° |
π 6 |
1 |
0° |
0 |