如图,在多面体ABC-A1B1C1中,AA1⊥平面ABC,AA1∥.BB1,AB=AC=AA1=22BC,B1C1∥.12BC.(1)求证:A1B1⊥平面AA1C;(2)求证:AB1∥平面A1C1C;(3)求二面角C1-A1C-A的余弦值.