1 . △ABC 中,若a、b、c成等比数列,且c = 2a,则cos B等于
A.![]() | B.![]() | C.![]() | D.![]() |
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5卷引用:2014-2015学年吉林省延边二中高二上学期期末考试理科数学试卷
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2 . 若平面向量
, ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f6538f76a3ec65a49200b8c784eb34.png)
,函数
.
(1)求函数
的值域;
(2)记
的内角
的对边长分别为
,若
,且
,求角C的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06a8f13e82995b9380140c183a2a25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2f6538f76a3ec65a49200b8c784eb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b1b873a6d3fceb57cfbc18b2c9d406.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdbd07c4967bf1350fcd7c23ec0d73d.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de2149fad0c24f659e92d29b55588d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69def215d32ff6734ad883a0ca260a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da8607bde1fa6cde631a46e921d959a0.png)
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6卷引用:吉林省白城市第一中学2020-2021学年高三上学期第三次月考数学(文)试题
10-11高一下·湖北宜昌·期中
3 . 在
中,三边
、
、
所对的角分别为
、
、
,已知
,
,
的面积S=
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133633851392/1570133638995968/STEM/621dc821e1b64e7cacdfeaf4300b9fe7.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133633851392/1570133638995968/STEM/895615b0183749038891bc03435f34d1.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133633851392/1570133638995968/STEM/f7c5e0ec516d4c8b857cde6d1d46b89b.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133633851392/1570133638995968/STEM/e146e2c4718e4790b647a986f8b65664.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133633851392/1570133638995968/STEM/9eb01d6af3f2441b93baac1f81ee0c35.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133633851392/1570133638995968/STEM/f8254285af254a41a496d8114d74caca.png?resizew=16)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fa79a550591eb9e1bd07bced3a08fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2011/4/28/1570133633851392/1570133638995968/STEM/aa7fa35a6b38491c8f6023ef50d2462b.png?resizew=24)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
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4 . 在
中,角
所对的边分别为
,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0ae8e92dd3119d41f2c830ea526516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ace74bfb716753490ebe0e740ff5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd5b9bbd3d22bd2cef53dd4b9691257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f1e5d29de6e4d72bfed62d9c14dde5.png)
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12卷引用:吉林省吉林市朝鲜族四校2019-2020学年高二上学期期末联考数学(文)试题
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