$$\sin (\alpha )={\displaystyle \frac{\text{Gegenkathete}}{\text{Hypotenuse}}}$$

$$\sin (\alpha )={\displaystyle \frac{a}{c}}$$

$$\tan (\beta )={\displaystyle \frac{\text{Gegenkathete}}{\text{Ankathete}}}$$

$$\tan (\beta )={\displaystyle \frac{b}{a}}$$