Gambar 2.1 Lingkaran dengan 4 kuadran
kuadran | $$I$$ | $$II$$ | $$III$$ | $$IV$$ |
---|---|---|---|---|
θ | ||||
sin θ | $$(Positif)\frac{y}{r}$$ |
$$(Positif)\frac{y}{r}$$ |
$$(Negatif)\frac{-y}{r}$$ |
$$(Negatif)\frac{-y}{r}$$ |
cos θ | $$(Positif)\frac{x}{r}$$ |
$$(Negatif)\frac{-x}{r}$$ |
$$(Negatif)\frac{-x}{r}$$ |
$$(Positif)\frac{x}{r}$$ |
tan θ | $$(Positif)\frac{y}{x}$$ |
$$(Negatif)\frac{y}{-x}$$ |
$$(Positif)\frac{-y}{-x}=\frac{y}{x}$$ |
$$(Negatif)\frac{-y}{x}$$ |