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如图,圆O:x2+y2=内的余弦函数y=cosx的图象与x轴围成的区域记为M(图...
如图,圆O:x
2+y
2=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850484325242/SYS201311030958504843252010_ST/0.png)
内的余弦函数y=cosx的图象与x轴围成的区域记为M(图中阴影部分),随机向圆内投一个点A,则点A落在区域M内的概率是
.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095850484325242/SYS201311030958504843252010_ST/images1.png)
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