Cos 480°+cot(-150)°-sin(-390)°+cosec 120° Mohon dibantu

cos 480° + cot (-150)° - sin (-390)° + cosec 120°
= cos 120° - cot 150° + sin 390° + cosec 120°
= -sin 30° + tan 60° + sin 30° + sec 30°
= -1/2 + akar3 + 1/2 + 2/3 akar3
= 5/3 akar3