$$\tan\ \beta\ \ =\frac{a}{c}$$

$$\tan\ \beta\ =\frac{b}{c}$$

$$\tan\beta\ =\frac{a}{b}$$

$$\tan\ \beta\ =\frac{b}{a}$$

$$\cos\ \beta\ \ =\frac{a}{c}$$

$$\cos\ \beta\ =\frac{b}{c}$$

$$\cos\beta\ =\frac{a}{b}$$

$$\cos\ \beta\ =\frac{c}{a}$$

$$\sin\ \beta\ \ =\frac{a}{c}$$

$$\sin\ \beta\ =\frac{b}{c}$$

$$\sin\beta\ =\frac{a}{b}$$

$$\sin\ \beta\ =\frac{c}{a}$$

$$\cos\ \alpha\ =\frac{a}{c}$$

$$\cos\ \alpha\ =\frac{b}{c}$$

$$\cos\alpha\ =\frac{a}{b}$$

$$\cos\ \alpha\ =\frac{c}{a}$$

$$\tan\ \alpha\ =\frac{a}{c}$$

$$\tan\ \alpha\ =\frac{b}{c}$$

$$\tan\alpha\ =\frac{a}{b}$$

$$\tan\ \alpha\ =\frac{c}{a}$$

$$\sin\ \varphi\ =\frac{x}{y}$$

$$\sin\ \varphi\ =\frac{x}{z}$$

$$\sin\ \varphi\ =\frac{y}{x}$$

$$\sin\ \varphi\ =\frac{y}{z}$$

$$\sin\ \varepsilon\ =\frac{z}{x}$$

$$\sin\ \varepsilon\ \ =\frac{x}{z}$$

$$\sin\ \varepsilon\ =\frac{y}{x}$$

$$\sin\ \varepsilon\ =\frac{y}{z}$$

$$\tan\varepsilon\ =\frac{x}{y}$$

$$\tan\ \varepsilon\ =\frac{x}{z}$$

$$\tan\ \varepsilon\ =\frac{y}{x}$$

$$\tan\ \varepsilon\ =\frac{z}{y}$$

$$\cos\ \varphi\ =\frac{x}{y}$$

$$\cos\ \varphi\ =\frac{x}{z}$$

$$\cos\ \varphi\ =\frac{y}{z}$$

$$\cos\ \varphi\ =\frac{z}{x}$$

$$\cos\varepsilon\ =\frac{x}{y}$$

$$\cos\ \varepsilon\ =\frac{y}{x}$$

$$\cos\ \varepsilon=\frac{y}{z}$$

$$\cos\ \varepsilon\ =\frac{z}{x}$$