1 . 已知A,B,C是
的三个内角,向量
,
,且
.
(1)求角A;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f129ff497171b4f78456158d68e89590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396d078c5e1434926e521aec98d3af3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41ed5777f5bce0912822e94bb116b2b.png)
(1)求角A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e4bf2f74b49a28ffb39974d0c72368d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e29b775e696045f44a4b1e7f74ef2.png)
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2020-02-05更新
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4卷引用:山东省济南市莱钢高级中学2022-2023学年高一下学期3月月考数学试题