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1 . 如图所示,在三棱锥
中,
,且
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,
分别是
,
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与
所成角的余弦值为___________ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f25845c3d902ce7b518d6e686431340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/139ad3d9-9711-4364-88f6-a8918d6c5fa2.png?resizew=150)
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2019-01-21更新
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3卷引用:安徽省合肥市肥东县综合高中2022-2023学年高二上学期期末数学试题
安徽省合肥市肥东县综合高中2022-2023学年高二上学期期末数学试题(已下线)特训01 期末选填题汇编(第1-4章,精选60道)-2023-2024学年高二数学《重难点题型·高分突破》(人教A版2019选择性必修第二册)【全国百强校】吉林省长春市第十一高中2018-2019学年高二上学期期末考试数学(理)试题