(文科做)已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/0.png)
=(cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/1.png)
x,sin
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/2.png)
x),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/3.png)
=(cos
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/4.png)
,-sin
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/5.png)
),且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/6.png)
,求:
①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/7.png)
及|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/8.png)
|;
②若f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/9.png)
-2λ|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/10.png)
|的最小值是
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757018_ST/11.png)
,求实数λ的值.
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757013_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183441842175768/SYS201310241834418421757013_ST/1.png)
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