正方体ABCD-A1B1C1D1中,AB的中点为M,DD1的中点为N,求异面直线CM与BN请帮我画个图,求异面直线CM与BN的余弦值
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![正方体ABCD-A1B1C1D1中,AB的中点为M,DD1的中点为N,求异面直线CM与BN请帮我画个图,求异面直线CM与BN的余弦值](/uploads/image/z/11367297-9-7.jpg?t=%E6%AD%A3%E6%96%B9%E4%BD%93ABCD-A1B1C1D1%E4%B8%AD%2CAB%E7%9A%84%E4%B8%AD%E7%82%B9%E4%B8%BAM%2CDD1%E7%9A%84%E4%B8%AD%E7%82%B9%E4%B8%BAN%2C%E6%B1%82%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BFCM%E4%B8%8EBN%E8%AF%B7%E5%B8%AE%E6%88%91%E7%94%BB%E4%B8%AA%E5%9B%BE%2C%E6%B1%82%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BFCM%E4%B8%8EBN%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC)
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