11-23 一质点质量为0.1kg,它同时参与互相垂直的两个振动,其振动表示式分别为-|||-=0.06cos (dfrac (pi )(3)t+dfrac (pi )(3)) , =0.03cos (dfrac (pi )(3)t-dfrac (pi )(3))-|||-试写出质点运动的轨迹方程,画出图形,并指明是左旋还是右旋。