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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB,则异面直线A1B与A...
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如图,正四棱柱ABCD-A
1B
1C
1D
1中,AA
1=2AB,则异面直线A
1B与AD
1所成角的余弦值为
.
考点分析:
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