» Funciones trigonométricas

\begin{align} \pi &= 3.1415926535897...\\ \\ 1\, rad &= \frac {180^{\circ}}{\pi} \approx 57.2957795131^{\circ}\\ \\ \alpha^{\circ}&=\alpha^{rad} \times \frac {180^{\circ}}{\pi}\\ \end{align}