名校
1 . 在
中,角A、B、C的对边分别a、b、c,向量
,
,且
.
(1)求
的值;
(2)若
,
,求角B的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2e3b00b7c57df1b016b3f2a6213319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7226a8048dd53b10dc0eacf51c61b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3b990397659798c1942c961ba157ff2.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b01adc561735ff5be9bb97266918f2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e7c12bff76b3a3151dc3e392c60d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23725094c363fd158166a8698971694c.png)
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解题方法
2 . 函数
的最小值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/346ca603a22ca7d96de1a38e335c200a.png)
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