已知
的面积为
,且
,当
时,求
与
的夹角的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf2e3b2eb83eb2fe1119e78f4e6e8eaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10e8abf8690e4b129466ddb918bcc94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2533b6e4f1b37931931de7a887ac9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5efb8adb11535d90d8f7af66da4ac2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08493c1e001d85731cb4863ec38857fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa76fdc9b9ce34c8eb6b102b2dc4578b.png)
更新时间:2021-03-23 17:50:44
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适中
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解题方法
【推荐1】设
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(2)若角
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解答题-问答题
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适中
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【推荐2】在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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(1)求
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【推荐2】已知向量
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0891a1d0f813ace9b5a9a9c86678b3ca.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969604545902c9a66549a4a44ec3a3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ab17fd4247cdd710c363d5d3fbc5bd.png)
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