Gambar 1.1 Segitiga Siku-siku \(ABC\)
$$sin \space β = \frac{sisi \space depan}{sisi \space miring}=\frac{de}{mi}$$
$$cos \space β = \frac{sisi \space samping}{sisi \space miring}=\frac{sa}{mi}$$
$$tan \space β = \frac{sisi \space depan}{sisi \space samping}=\frac{de}{sa}$$
$$sin \space β = \frac{sisi \space depan}{sisi \space miring}$$ | \(=\) | AB | |
BO | |||
$$cos \space β = \frac{sisi \space samping}{sisi \space miring}$$ | \(=\) | ||
$$tan \space β = \frac{sisi \space depan}{sisi \space samping}$$ | \(=\) | ||