# Dari Definisi Segitiga Siku-Siku

$$\begin{align*} \sin(\theta) & =\frac{BC}{AC}\\ \cos(\theta) & =\frac{AB}{AC}\\ \tan(\theta) & =\frac{BC}{AB}\\ \sin(90\degree-\theta) & =\frac{AB}{AC}\\ \cos(90\degree-\theta) & =\frac{BC}{AC}\\ \tan(90\degree-\theta) & =\frac{AB}{BC}\\ \sin(\theta) & =\cos(90\degree-\theta)\\ \cos(\theta) & =\sin(90\degree-\theta)\\ \tan(\theta) & =\frac{1}{(\dfrac{AB}{BC})}\\ & =\frac{1}{\tan(90\degree-\theta)} \end{align*}$$

# Kesimpulan

Untuk $\theta$ sudut apapun:

$$\begin{align*} \sin(\theta) &=\cos(90\degree-\theta)\\ \cos(\theta) &=\sin(90\degree-\theta)\\ \tan(\theta) &=\dfrac{1}{\tan(90\degree-\theta)}\\ \end{align*}$$