正四面体ABCD中,E,F分别是AB和CD的中点,则异面直线CE和AF所成角的余弦值为( )
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21-22高一下·重庆北碚·期末 查看更多[6]
重庆市西南大学附属中学2021-2022学年高一下学期期末数学试题(已下线)第09讲 立体几何与空间向量 章节总结 (讲)-1安徽省六安市舒城中学2022-2023学年高二上学期开学考试数学试题江苏省扬州市宝应县2022-2023学年高三上学期期初检测数学试题(已下线)模块四 专题5 期末重组综合练(重庆)四川省成都列五中学2023-2024学年高二上学期阶段性考试(一)数学试题
更新时间:2022-07-16 22:14:38
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【推荐1】已知平面向量
满足
,且
与
的夹角为
,则
的最大值为( )
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【推荐2】在
中,角
,
,
所对的边分别为
,
,
,已知
,
的面积为
,且
,则
的值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】在棱长为1的正方体
中,
是正方形
的中心,则直线
与直线
所成角的余弦值为( )
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【推荐2】如图,正方形
与正方形
所成角的二面角的平面角的大小是
是正方形
所在平面内的一条动直线,则直线
与
所成角的取值范围是( )
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