已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471722431/SYS201310251242474717224015_ST/0.png)
=(sinA,cosA),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471722431/SYS201310251242474717224015_ST/1.png)
=(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471722431/SYS201310251242474717224015_ST/2.png)
,-1),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471722431/SYS201310251242474717224015_ST/3.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124247471722431/SYS201310251242474717224015_ST/4.png)
=1,且A为锐角.
(1)求角A的大小;
(2)求函数f(x)=cos2x+4cosAsinx(x∈R)的值域.
考点分析:
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