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解题方法
1 . 已知向量
=(cos
,sin
),![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
=(-sin
,-cos
),其中x∈[
,π].
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a92e6eba8dab638fd66831cd3a0b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f33812860f09b18662de5b3cf429fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f33812860f09b18662de5b3cf429fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427fa45527d0ce469bfd060bf6f991f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1020afcfd8b7de38dfd825373b86bdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1020afcfd8b7de38dfd825373b86bdea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
(1)若|+
|=
,求x的值;
(2)函数f(x)=·
+|
+
|2,若
恒成立,求实数c的取值范围.
您最近一年使用:0次
2016-12-04更新
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685次组卷
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4卷引用:2017届河北省定州中学高三上周练一数学试卷