π/6sin(5π/3)=sin(2π-π/3)=-sin(π/3)=-(√3)/2cos(5π/3)=coss(2π-π/3)=cos(π/3)=1/2所以：角a的终边上一点的坐标是(-(√3)/2,1/2)可见：角a位于第二象限tana=(1/2)/[-(√3)/2]=-(√3)/3因此,角a的最小正值...