在
中,向量
,向量
,且满足
.
(1)证明
,并求角
的大小;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9acfd39865a7dce3debdfc6175e8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3b5652ac4f3a1ee5124b246ea6f334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1abf135623342e07c687c2d3de3321cd.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ee59964f020fc52b5ba66a3f5fcc3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72a766369b1d8df29f61aeaed1611481.png)
更新时间:2022-05-04 23:28:50
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【推荐1】设向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f6486933fe3c2459cb13943244a088.png)
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