sin

$$\frac{\sin(\text{A})}{\text{a}} = \frac{\sin(\text{B})}{\text{b}} = \frac{\sin(\text{C})}{\text{c}}$$

$$\sin(2\theta) = 2 \cdot \sin(\theta) \cdot \cos(\theta)$$

$$\scriptsize \sin(a \pm b) = \sin(a) \cos(b) \pm \cos(a) \sin(b)$$