如图,在四棱锥P-ABCD中,底面ABCD是正方形,PD⊥平面ABCD,且PD=AB=2,E是PB的中点1.求漆面直线PD与AE所成角的正切值2.求证:EF垂直平面PBC3.求二面角F-PC-B的余弦值
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![如图,在四棱锥P-ABCD中,底面ABCD是正方形,PD⊥平面ABCD,且PD=AB=2,E是PB的中点1.求漆面直线PD与AE所成角的正切值2.求证:EF垂直平面PBC3.求二面角F-PC-B的余弦值](/uploads/image/z/13376584-64-4.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%9B%9B%E6%A3%B1%E9%94%A5P-ABCD%E4%B8%AD%2C%E5%BA%95%E9%9D%A2ABCD%E6%98%AF%E6%AD%A3%E6%96%B9%E5%BD%A2%2CPD%E2%8A%A5%E5%B9%B3%E9%9D%A2ABCD%2C%E4%B8%94PD%3DAB%3D2%2CE%E6%98%AFPB%E7%9A%84%E4%B8%AD%E7%82%B91.%E6%B1%82%E6%BC%86%E9%9D%A2%E7%9B%B4%E7%BA%BFPD%E4%B8%8EAE%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E6%AD%A3%E5%88%87%E5%80%BC2.%E6%B1%82%E8%AF%81%EF%BC%9AEF%E5%9E%82%E7%9B%B4%E5%B9%B3%E9%9D%A2PBC3.%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92F-PC-B%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC)
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