210,240,270,310,330,度的各角正弦,余弦函数值
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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
![210,240,270,310,330,度的各角正弦,余弦函数值](/uploads/image/z/8781464-56-4.jpg?t=210%2C240%2C270%2C310%2C330%2C%E5%BA%A6%E7%9A%84%E5%90%84%E8%A7%92%E6%AD%A3%E5%BC%A6%2C%E4%BD%99%E5%BC%A6%E5%87%BD%E6%95%B0%E5%80%BC)
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