| x (radians) | 0 | \dfrac{\pi}{6} | \dfrac{\pi}{4} | \dfrac{\pi}{3} | \dfrac{\pi}{2} | \pi | \dfrac{3\pi}{2} | 2\pi |
|---|---|---|---|---|---|---|---|---|
| x (degrés) | 0 | 30 | 45 | 60 | 90 | 180 | 270 | 360 |
| cos(x) | 1 | \dfrac{\sqrt{3}}{2} | \dfrac{\sqrt{2}}{2} | \dfrac{1}{2} | 0 | -1 | 0 | 1 |
| sin(x) | 0 | \dfrac{1}{2} | \dfrac{\sqrt{2}}{2} | \dfrac{\sqrt{3}}{2} | 1 | 0 | -1 | 0 |
Pour tout réel x : sin^{2}x+cos^{2}x=1