Tentukan nilai berikut: a.cos 330° b.cot 120° c.cos(-45°)

Kelas 10 Matematika
Bab Trigonometri

a] cos 330°
= cos (360° - 30°)
= cos 30°
= 1/2 √3

b] cot 120°
= 1/tan 120°
= -1/√3
= -1/3 √3

c] cos (-45°)
= cos 45°
= 1/2 √2