作业帮210,240,270,310,330,度的各角正弦,余弦函数值
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/05/10 07:37:34
210,240,270,310,330,度的各角正弦,余弦函数值
就这几个角的正弦,余弦函数值
就这几个角的正弦,余弦函数值
sin210°=sin(180°+30°)=-sin30°=-1/2
sin240°=sin(180°+60°)=-sin60°=-√3/2
sin270°=sin(180°+90°)=-sin90°=-1
sin300°=sin(360°-60°)=-sin60°=-√3/2
sin330°=sin(360°-30°)=-sin30°=-1/2
cos210°=cos(180°+30°)=-cos30°=-√3/2
cos240°=cos(180°+60°)=-cos60°=-1/2
cos270°=cos(180°+90°)=-cos90°=0
cos300°=cos(360°-60°)=cos60°=1/2
cos330°=cos(360°-30°)=cos30°=√3/2
sin240°=sin(180°+60°)=-sin60°=-√3/2
sin270°=sin(180°+90°)=-sin90°=-1
sin300°=sin(360°-60°)=-sin60°=-√3/2
sin330°=sin(360°-30°)=-sin30°=-1/2
cos210°=cos(180°+30°)=-cos30°=-√3/2
cos240°=cos(180°+60°)=-cos60°=-1/2
cos270°=cos(180°+90°)=-cos90°=0
cos300°=cos(360°-60°)=cos60°=1/2
cos330°=cos(360°-30°)=cos30°=√3/2