已知函数
.
(Ⅰ)求函数
的最大值,并写出
取最大值时
的取值集合;
(Ⅱ)已知
中,角A,B,C的对边分别为a,b,c若
b+c=2.求实数a的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080263262208/1573080269570048/STEM/966d94f1c236455f975d69dc60d0aecd.png)
(Ⅰ)求函数
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080263262208/1573080269570048/STEM/ab3f560761ff4994b9604400f253cb81.png)
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080263262208/1573080269570048/STEM/ab3f560761ff4994b9604400f253cb81.png)
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080263262208/1573080269570048/STEM/f1036959bff04293896e0fe33a6868ee.png)
(Ⅱ)已知
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573080263262208/1573080269570048/STEM/46a0bb6ed61e42acba7a6caa67133588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7776bd62456b78c33d097c572dbae23.png)
更新时间:2016-12-04 22:22:54
|
【知识点】 三角函数的图象与性质
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解答题-问答题
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解题方法
【推荐1】已知函数
的图象关于点
对称.
(1)求
的值;
(2)将函数
的图象向右平移
个单位,然后将所得的图象上各点的横坐标缩小到原来的
倍(纵坐标不变),得到函数
的图象.当
时,求函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8467b187d868944ac803aed5855a5e57.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(2)将函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b63a87545fb8a1913ad16e376d42bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
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【推荐2】设函数
.
(1)求
的单调增区间;
(2)说明函数
的图像可由
的图象经过怎样的变化得到.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4276c8805a196b2a248e96d4c14f55e1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)说明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b9643da0c0fea4f099f9a9133d6076.png)
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【推荐3】已知函数
.
(1)求
的最小正周期以及单调增区间;
(2)求
在
的最大值及对应的x值;
(3)若
图象的对称轴只有一条落在区间
上,求m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a26a3e1e5c0fe240b58b3c4c1ad3e90.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9f4ad8ba067196724a6c13e30ff8eb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3f7f762131c77a3c8440b4a3bc1d12.png)
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