Funcţii trigonometrice. Tabelul valorilor uzuale — Teorie

$\begin{matrix} 30 ° & 45 ° & 60 ° \\ s i n & \frac{1}{2} & \frac{\sqrt{2}}{2} & \frac{\sqrt{3}}{2} \\ c o s & \frac{\sqrt{3}}{2} & \frac{\sqrt{2}}{2} & \frac{1}{2} \\ t g & \frac{\sqrt{3}}{3} & 1 & \sqrt{3} \\ c t g & \sqrt{3} & 1 & \frac{\sqrt{3}}{3} \end{matrix}$