cos(1)+cos(1+п)+sin(-п/3)+cos(-п/6)=cos(1)+cos(1+п)-корень(3)/2+корень(3)/2=cos(1)+cos(1+п)=cos(1)-cos(1)=0
cos(1)+cos(1+п)+sin(-п/3)+cos(-п/6)=cos(1)+cos(1+п)-корень(3)/2+корень(3)/2=cos(1)+cos(1+п)=cos(1)-cos(1)=0