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在四棱锥P﹣ABCD中,底面是边长为2的菱形,∠DAB=60°,对角线AC与BD相交于点O,PO⊥平面ABCD,PB与平面ABCD所成角为45°,若E是PB的中点,则异面直线DE与PA所成角的余弦值...
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高二上学期数学《2017-2018学年河南省洛阳一中高二(上)12月月考数学试卷(理科)》真题及答案
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