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已知:如图,PA为⊙O的切线,A为切点,PO交⊙O于点B,PA=4,OA=3,则...
已知:如图,PA为⊙O的切线,A为切点,PO交⊙O于点B,PA=4,OA=3,则cos∠APO的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164101255765827/SYS201310221641012557658005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164101255765827/SYS201310221641012557658005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164101255765827/SYS201310221641012557658005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164101255765827/SYS201310221641012557658005_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164101255765827/SYS201310221641012557658005_ST/3.png)
考点分析:
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