SUMMARY W SIN 12 山a.C0s 2+u STANT NOW COJSIDER ANGULAR MO MENTVM 甙 FIXED BuT As Y RoTATES EXPECT THE PROTECTION DF 工 THE BoDY FRAME,,与 WILL CHANGE WH TIME 工 工2工2山zCs八 工3 Hu= I 叫,·Ha5 h H3 NSTE M STILL DEFINES ANGLE FRoM T·H、,+H1 e2 RE ON 0 LATER