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1 . 在平面直角坐标系中,设向量
,
,其中A,B分别是
的两个内角.
(1)若
,求C的值;
(2)若
,
,求
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683976c40f07c5a55475cef91487b7d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c3520a70c84054b763ccd55190d9fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede701c23a446020d1471fd8cdd9eca9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b7e5d7956ff765190ba8042212e967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2020-08-10更新
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