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(2008•毕节地区)如图所示,已知⊙O是△ABC的外接圆,AD是⊙O的直径,连...
(2008•毕节地区)如图所示,已知⊙O是△ABC的外接圆,AD是⊙O的直径,连接CD,若AD=3,AC=2,则cosD的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/201310201203347622074380/SYS201310201203347622074010_ST/images0.png)
A.
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B.
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C.
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D.
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