直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230356846872437/SYS201311012303568468724013_ST/0.png)
与y轴的夹角的大小为
.
考点分析:
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设AB是已知圆的直径(如图),C是线段AB上一点,D是此圆周上一点(不同于A、B),且
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2
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