sin0°=0 sin30°=1/2 sin45°=√2/2 sin60°=√3/2 sin90°=1 sin120°=√3/2 sin135°=√2/2 sin150°=1/2 sin180°=0 cos0°=1 con30°=√3/2 con45°=√2/2 con60°=1/2 con90°=0 con120°=-1/2 con135°=-√2/2 con150°=-√3/2 con180°=-1 tan0°=0 tan30°=√3/3 tan45°=1 tan60°=√3 tan90°=不存在 tan120°=-√3 tan135°=-1 tan150°=-√3/3 tan180°=0 tan=sinα/conα 1.sin(α＋2kπ)=sinα cos(α＋2kπ)=conα tan(α＋2kπ)=tanα