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(2003•茂名)如图,在Rt△ABC中,∠C=90°,BC=a,CA=b,AB...
(2003•茂名)如图,在Rt△ABC中,∠C=90°,BC=a,CA=b,AB=C,则下列结论正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144006_ST/images0.png)
A.sinB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144006_ST/0.png)
B.cosB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144006_ST/1.png)
C.tanB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144006_ST/2.png)
D.cotB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144006_ST/3.png)
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