求解图中的所有题
1个回答
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1.tan210°=tan(180°+30°)=tan30°=√3/3
2.cos(7π/6)=cos(π+π/6)=-cos(π/6)=-√3/2
3.sin225°=sin(180°+45°)=-sin45°=-√2/2
4.cot(4π/3)=1/[tan(4π/3)]=1/[tan(π+π/3)]=1/[tan(π/3)]=1/√3=√3/3
tan(-π/3)=-tan(π/3)=-√3
cos(-210°)=cos210°=cos(180°+30°)=-cos30°=-√3/2
2.cos(7π/6)=cos(π+π/6)=-cos(π/6)=-√3/2
3.sin225°=sin(180°+45°)=-sin45°=-√2/2
4.cot(4π/3)=1/[tan(4π/3)]=1/[tan(π+π/3)]=1/[tan(π/3)]=1/√3=√3/3
tan(-π/3)=-tan(π/3)=-√3
cos(-210°)=cos210°=cos(180°+30°)=-cos30°=-√3/2
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