一个解够了,财富给最快回答的朋友,已知正三棱柱ABC-abc所有棱长都相等,EF分别为Cc与Aa的中点,则异面直线BE与AF所成角的余弦值为多少.
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![一个解够了,财富给最快回答的朋友,已知正三棱柱ABC-abc所有棱长都相等,EF分别为Cc与Aa的中点,则异面直线BE与AF所成角的余弦值为多少.](/uploads/image/z/938130-42-0.jpg?t=%E4%B8%80%E4%B8%AA%E8%A7%A3%E5%A4%9F%E4%BA%86%2C%E8%B4%A2%E5%AF%8C%E7%BB%99%E6%9C%80%E5%BF%AB%E5%9B%9E%E7%AD%94%E7%9A%84%E6%9C%8B%E5%8F%8B%2C%E5%B7%B2%E7%9F%A5%E6%AD%A3%E4%B8%89%E6%A3%B1%E6%9F%B1ABC-abc%E6%89%80%E6%9C%89%E6%A3%B1%E9%95%BF%E9%83%BD%E7%9B%B8%E7%AD%89%2CEF%E5%88%86%E5%88%AB%E4%B8%BACc%E4%B8%8EAa%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%88%99%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BFBE%E4%B8%8EAF%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91.)
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