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如图,已知直角三角形ABC中,斜边AB的长为m,∠B=40°,则直角边BC的长是...
如图,已知直角三角形ABC中,斜边AB的长为m,∠B=40°,则直角边BC的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161600199936616/SYS201310221616001999366009_ST/images0.png)
A.msin40°
B.mcos40°
C.mtan40°
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022161600199936616/SYS201310221616001999366009_ST/0.png)
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