tan10°-√3)sin40°=(tan10°-tan60°)sin40°=(sin10°/cos10°-sin60°/cos60°)sin40°=sin40°*(sin10°*cos60-cos10°*sin60°)/(cos10°*cos60°)=sin40°*sin(10°-60°)/(cos10°*1/2)=-2sin40°*sin50°/c...