Trigonometrik nisbatlar va aniq qiymatlar

To'g'ri burchakli uchburchakda

O'tkir burchak $\alpha$ uchun:

$\sin\alpha = \frac{\text{qarshisidagi katet}}{\text{gipotenuza}} \qquad \cos\alpha = \frac{\text{yonidagi katet}}{\text{gipotenuza}} \qquad \tan\alpha = \frac{\text{qarshisidagi}}{\text{yonidagi}} = \frac{\sin\alpha}{\cos\alpha}$

Misol 1. Gipotenuza $10$, burchak $30^\circ$: qarshisidagi katet $10 \sin 30^\circ = 5$, yonidagi $10 \cos 30^\circ = 5\sqrt{3}$.