sin 150° = sin180°−30°180° - 30°180°−30° = sin 30° = 0.5
cos 150° = cos180°−30°180° - 30°180°−30° = -cos 30° = -√3/2
sin 150° = sin180°−30°180° - 30°180°−30° = sin 30° = 0.5
cos 150° = cos180°−30°180° - 30°180°−30° = -cos 30° = -√3/2