已知角α的顶点在原点,始边与x轴的正半轴重合,终边经过点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101221045793809/SYS201311031012210457938020_ST/0.png)
.
(1)求sin2α-tanα的值;
(2)若函数f(x)=cos(x-α)cosα-sin(x-α)sinα,求函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101221045793809/SYS201311031012210457938020_ST/1.png)
在区间
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101221045793809/SYS201311031012210457938020_ST/2.png)
上的取值范围.
考点分析:
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