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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3...
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如图,正四棱柱ABCD-A
1B
1C
1D
1中,AA
1=2AB=4,点E在CC
1上且C
1E=3EC.
(1)求异面直线A
1D与B
1B所成角的正切值;
(2)证明:A
1C⊥平面BED;
(3)求二面角A
1-DE-B的余弦值.
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(1)求异面直线A1D与B1B所成角的正切值;
(2)证明:A1C⊥平面BED;
(3)求二面角A1-DE-B的余弦值.
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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3EC.
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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3EC.
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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3EC.
(Ⅰ)证明:A1C⊥平面BED;
(Ⅱ)求二面角A1-DE-B的大小.
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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3EC.
(Ⅰ)证明:A1C⊥平面BED;
(Ⅱ)求二面角A1-DE-B的大小.
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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3EC.
(Ⅰ)证明:A1C⊥平面BED;
(Ⅱ)求二面角A1-DE-B的大小.
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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3EC.
(Ⅰ)证明:A1C⊥平面BED;
(Ⅱ)求二面角A1-DE-B的大小.
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如图,正四棱柱ABCD-A1B1C1D1中,AA1=2AB=4,点E在CC1上且C1E=3EC
(1)证明:A1C⊥平面BED;
(2)求二面角A1-DE-B的余弦值.