如图,直三棱柱
中,
,
,
,
分别是
,
的中点,则
与
所成的角的余弦值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1604adab63e6350177d8130123dca0f9.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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758276252459008/2760008548941824/STEM/1f3ac683-d73a-47e4-b2dd-b85ef7d99a11.png?resizew=225)
20-21高一下·浙江·期末 查看更多[2]
更新时间:2021-07-08 21:14:40
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【知识点】 异面直线夹角的向量求法
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【推荐1】已知正四面体VABC的棱长为2,E,F分别是棱VA,BC的中点,则该正四面体外接球的表面积为___________ .异面直线BE与VF所成角的余弦值为___________ .
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/db925cc7-313e-4666-8dc7-39358db3339a.png?resizew=181)
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