已知向量
,把函数
化简为
的形式后,利用“五点法”画
在某一个周期内的图象时,列表并填入的部分数据如下表所示:
(1)请直接写出
①处应填的值,并求
的值及函数
在区间
上的单增区间、单减区间;
(2)设
的内角
所对的边分别为
,已知
求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f880806c2c30caf35e9619908253975e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd49edac8347876642c4c018913e23ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a131eb604cfb56124968c66104e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![]() | ![]() | ![]() | ![]() | ||
![]() | 0 | ![]() | ① | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
(1)请直接写出
![](https://img.xkw.com/dksih/QBM/2017/5/12/1685504332980224/1689460957184000/STEM/4cda70785b484b53aa696d3b8cd55b69.png?resizew=19)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baed88d75c306756132de528040b6e34.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da3219c8285658b99ecae00e9f6c8d2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3aba0029610467694896f3ca4806f8.png)
更新时间:2017-05-18 08:40:01
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