1- sin(2π/3 - a)/sina
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1- sin(2π/3 - a)/sina
1- sin(2π/3 - a)/sina
1- sin(2π/3 - a)/sina
因为2π/3 在Y轴负半轴上,
则2π/3-a在第3象限上
则sin(2π/3-a)=-cosa
1- sin(2π/3 - a)/sina
=1+cosa/sina
=1+cota
因为2π/3 在Y轴负半轴上,
则2π/3-a在第3象限上
则sin(2π/3-a)=-cosa
1- sin(2π/3 - a)/sina
=1+cosa/sina
=1+cota
3/2-(跟下3/2)*cota
sin((3π)/3-a)=sin(π+(1/2-a))=-(sin(1/2-a))=-cosa
1- sin(2π/3 - a)/sina
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