四边形ABCD是边长为1的正方形,MD⊥平面ABCD,NB⊥平面ABCD,且MD=NB=1,E为BC的中点(1)求异面直线NE与AM所成角的余弦值; (2)在线段AN上是否存在点S,使得ES⊥平面AMN?若存在,求线段AS的长;若不存
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![四边形ABCD是边长为1的正方形,MD⊥平面ABCD,NB⊥平面ABCD,且MD=NB=1,E为BC的中点(1)求异面直线NE与AM所成角的余弦值; (2)在线段AN上是否存在点S,使得ES⊥平面AMN?若存在,求线段AS的长;若不存](/uploads/image/z/5469292-28-2.jpg?t=%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E6%98%AF%E8%BE%B9%E9%95%BF%E4%B8%BA1%E7%9A%84%E6%AD%A3%E6%96%B9%E5%BD%A2%2CMD%E2%8A%A5%E5%B9%B3%E9%9D%A2ABCD%2CNB%E2%8A%A5%E5%B9%B3%E9%9D%A2ABCD%2C%E4%B8%94MD%3DNB%3D1%2CE%E4%B8%BABC%E7%9A%84%E4%B8%AD%E7%82%B9%EF%BC%881%EF%BC%89%E6%B1%82%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BFNE%E4%B8%8EAM%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%EF%BC%9B+%EF%BC%882%EF%BC%89%E5%9C%A8%E7%BA%BF%E6%AE%B5AN%E4%B8%8A%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E7%82%B9S%2C%E4%BD%BF%E5%BE%97ES%E2%8A%A5%E5%B9%B3%E9%9D%A2AMN%3F%E8%8B%A5%E5%AD%98%E5%9C%A8%2C%E6%B1%82%E7%BA%BF%E6%AE%B5AS%E7%9A%84%E9%95%BF%EF%BC%9B%E8%8B%A5%E4%B8%8D%E5%AD%98)
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