Hasil 2cos 120 derajat + sin 330 derajat -cos 240 derajat

2 * cos 120 = cos(180-60) = -cos60 = -1/2 * 2 = —1
sin330 = sin(360-30) = -sin30 = -1/2
cos240 = cos(180+60) = -cos60 = -1/2

2 cos 120° + sin 330° — cos 240°
= -1 + (-1/2) — (-1/2)
= -1 – (1/2) + 1/2
= -1