正方体ABCD-A1B1C1D1中,M,N,E,F分别是A1D1,A1B1,D1C1,B1C1的中点,求直线AM与BD所成角的余弦值
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![正方体ABCD-A1B1C1D1中,M,N,E,F分别是A1D1,A1B1,D1C1,B1C1的中点,求直线AM与BD所成角的余弦值](/uploads/image/z/13946413-13-3.jpg?t=%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A1B1C1D1%E4%B8%AD%2CM%2CN%2CE%2CF%E5%88%86%E5%88%AB%E6%98%AFA1D1%2CA1B1%2CD1C1%2CB1C1%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82%E7%9B%B4%E7%BA%BFAM%E4%B8%8EBD%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC)
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