已知
,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7ce00cb16fd135d14f73b585408e119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8febe21078f09e154aceaa850458f85d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36fe19e8725a3c1689007b0ada3af643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146fc0a63e5c14a8fa46573e60c07ba.png)
更新时间:2023-02-19 10:12:04
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解答题-问答题
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较易
(0.85)
名校
解题方法
【推荐2】在
中,角A,B,C的对边分别为a,b,c,
,且
.
(1)判断
的形状;
(2)若
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,以
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503132521af12ec028431a6010a74e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b1e717e9fc4481050672eec8ac5c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-问答题
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较易
(0.85)
名校
【推荐2】已知向量
,
,设
.
(1)求函数
的对称中心;
(2)已知
为锐角,
,
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0e433f0e3aa9fe2b514e3aa3140a882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e33128495afc5041f2b48f8e1a08b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274129452a6ba447a6f3037a8c30a23e.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab10594b7dadac5b712b031bf3f4e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e42f4c29822757ea19c5ccfd447967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b25bdf4fc404eb20e20d5e1c1fc6f08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c871debfd2b8a233e7068bb5156da0.png)
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