已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/0.png)
=(1,1),向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/1.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/2.png)
的夹角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/3.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/4.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/5.png)
=-1.
(1)求向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/6.png)
;
(2)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/7.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/8.png)
=(1,0)的夹角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/9.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/10.png)
=(cosA,2cos
2![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/11.png)
)其中A、C为△ABC的内角,且A+C=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/12.png)
,求|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/13.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025717422465/SYS201311031010257174224019_ST/14.png)
|的最小值.
考点分析:
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