sin 3x= sin 60° himpunan prsamaan dari 0°

3x = 60 + 360k
x = 20 + 120k
k = 0 → x =20°
k = 1 → x = 140°
k = 2 → x = 260°
3x = 180 - 60 + 360k
x = 40 + 120k
k = 0 → x = 40°
k = 1 → x = 160°
k = 2 → x = 280°
hp = {20°, 40°, 140°, 160°, 260°, 280°}