在三棱锥
中(如图所示)
,
,则二面角
的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fc394e2c20d20d9d951beff652bde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ee7262d0b5cbbade014e07e7373501.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
22-23高一下·天津河东·期末 查看更多[2]
更新时间:2023-07-08 17:32:05
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【推荐1】在锐角
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【推荐2】若平面向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
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①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
②二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb1ae4a2a697ce14f87af49d2a75e747.png)
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③点
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④线段
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