设A是单位圆和x轴正半轴的交点,P,Q是单位圆上两点,O是坐标原点,且∠AOP=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988695769/SYS201311012310429886957015_ST/0.png)
,∠AOQ=α,α∈[0,π).
(Ⅰ)若点Q的坐标是 (m,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988695769/SYS201311012310429886957015_ST/1.png)
),求cos(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988695769/SYS201311012310429886957015_ST/2.png)
)的值;
(Ⅱ)设函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231042988695769/SYS201311012310429886957015_ST/3.png)
,求f(a)的值域.
考点分析:
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