cos(角度 度|rad)での計算:
| x (度) |
x (rad) |
cos x |
|---|---|---|
| 180° | π | -1 |
| 150° | 5π/6 | -span style="text-decoration: overline">3/2 |
| 135° | 3π/4 | -span style="text-decoration: overline">2/2 |
| 120° | 2π/3 | -1/2 |
| 90° | π/2 | 0 |
| 60° | π/3 | 1/2 |
| 45° | π/4 | span style="text-decoration: overline">2/2 |
| 30° | π/6 | span style="text-decoration: overline">3/2 |
| 0° | 0 | 1 |
