在
中,
分别是内角
的对边,且2cos A·cos C(tan Atan C-1)=1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(1)求的大小;
(2)若,
,求
的面积.
2014·山东青岛·一模 查看更多[8]
(已下线)2014届山东省青岛市高三统一质量检测考试理科数学试卷(已下线)2014届山东省青岛市高三统一质量检测考试文科数学试卷(已下线)2015届浙江省杭州外国语学校高三上学期期中考试文科数学试卷2014-2015学年福建省泉州一中高一上学期期中考试文科数学试卷2017届湖南郴州市高三理第二次质监数学试卷黑龙江省鹤岗市第一中学2016-2017学年高一下学期期末考试数学(文)试题【全国百强校】黑龙江省双鸭山市第一中学2017-2018学年高一下学期第二次(6月)月考数学(理)试题四川省成都市郫都区2019-2020学年高二上学期期中数学试题
更新时间:2018-06-22 07:00:02
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【推荐1】已知向量
,
,函数
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(1)若
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(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/076559f08d17fb25e82886e791719e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64cd502af8424288431c6d6f27b89f73.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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【推荐2】已知a,b,c分别为
三个内角A,B,C的对边,且满足
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185f646530d4dc8b011c041c26d834db.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af039cad52ca4e1f1e322277bc81afd.png)
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【推荐1】记
的内角
,
,
的对边分别为
,
,
,点
在边
上,且满足
,
的面积![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b678e9ab75e74a2c10bbc88594498a.png)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84dddab8e14a19fb0ad6c6bfffb7f7f0.png)
(2)求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84dddab8e14a19fb0ad6c6bfffb7f7f0.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d54d09ef825305de83671448a3dea21.png)
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【推荐2】在中,角
所对的边分别为
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(2)如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5fc4ad65b723b6a8da4c8dac154e6e.png)
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