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如图,四棱锥P-ABCD中,PA⊥平面ABCD,四边形ABCD是矩形,E、F分别是AB、PD的中点.若PA=AD=3,
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.
(1)求证:AF∥平面PCE;
(2)求点F到平面PCE的距离;
(3)求直线FC平面PCE所成角的大小.
考点分析:
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