已知
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b1029ae8e4120c872408387aea94a3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78685c6dab1fc304630a218e41f89139.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5d9cb60074110912aeffa4ce150cf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b1029ae8e4120c872408387aea94a3.png)
更新时间:2020-04-23 23:38:48
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解题方法
【推荐1】已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46902ee9fbd30111d7831f1fc7b79641.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6167ab78baf39a8a316dcd0286841155.png)
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【推荐2】已知点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】设α为锐角,若
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