왜 f(x)=sin(180/3-x)=-sin(x-180/3)=sin(x+360/3)=sin(x+210-90) 180 은 파..안 나 와..

왜 f(x)=sin(180/3-x)=-sin(x-180/3)=sin(x+360/3)=sin(x+210-90) 180 은 파..안 나 와..

f(x)=sin(180/3-x)=-sin(x-180/3)=sin(x+360/3)=sin(x+210-90)