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在正方形网格中,∠BAC如图放置,点A,B,C都在格点上,则sin∠BAC的值为...
在正方形网格中,∠BAC如图放置,点A,B,C都在格点上,则sin∠BAC的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164006_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164006_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164006_ST/3.png)
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164004_ST/images1.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190318892516466/SYS201311011903188925164001_ST/images1.png)
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D.
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