1) cos 150° = -cos 30° =
2) sin 135° = sin 45° =
3) cos 120° = -cos 60° =
4) sin 315° = -sin 45° =
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1) cos 150° = -cos 30° =
2) sin 135° = sin 45° =
3) cos 120° = -cos 60° =
4) sin 315° = -sin 45° =