三角函数参考
常用角参考表
| 角度 | sin | cos | tan | csc | sec | cot |
|---|---|---|---|---|---|---|
| 0° (0) | 0 | 1 | 0 | — | 1 | — |
| 30° (π/6) | 1/2 | √3/2 | 1/√3 | 2 | 2/√3 | √3 |
| 45° (π/4) | √2/2 | √2/2 | 1 | √2 | √2 | 1 |
| 60° (π/3) | √3/2 | 1/2 | √3 | 2/√3 | 2 | 1/√3 |
| 90° (π/2) | 1 | 0 | — | 1 | — | 0 |
| 120° (2π/3) | √3/2 | -1/2 | -√3 | 2/√3 | -2 | -1/√3 |
| 135° (3π/4) | √2/2 | -√2/2 | -1 | √2 | -√2 | -1 |
| 150° (5π/6) | 1/2 | -√3/2 | -1/√3 | 2 | -2/√3 | -√3 |
| 180° (π) | 0 | -1 | 0 | — | -1 | — |
| 270° (3π/2) | -1 | 0 | — | -1 | — | 0 |
| 360° (2π) | 0 | 1 | 0 | — | 1 | — |