Question

Cos(-15°)=...?
Berapa hasilnya

Answer 1

Cos (-15°) = 0,965 dibulatkan menjadi 0,97

Answer 2

Cos (-15) = cos 15
= cos (45 - 30)
= cos 45 cos 30 + sin 45 sin 30
= (1/2)√2 x (1/2)√3 + (1/2)√2 x 1/2
= (1/4)√6 + (1/4)√2
= (1/4)(√6 + √2)