jangan pelit ilmu ya hehe

1. AC² = 12² + 5²
= 144 + 25
= akar 169
= 13
[tex] \cos\alpha = \frac{5}{13} \\ \sin \: \theta = \frac{5}{13} \\ \tan \alpha = \frac{12}{5} \\ [/tex]
2.
[tex] {r}^{2} = {( \sqrt{2} )}^{2} + {1}^{2} \\ \: \: r = \sqrt{5} [/tex]
[tex] \sin\alpha = \frac{y}{r} = \frac{ \sqrt{2} }{ \sqrt{5} } \\ \cos\alpha = \frac{1}{ \sqrt{5} } [/tex]