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如图,∠C=90°,AC=BC,M,N分别为BC和AB的中点,沿直线MN将△BM...
如图,∠C=90°,AC=BC,M,N分别为BC和AB的中点,沿直线MN将△BMN折起,使二面角B′-MN-B为60°,则斜线B'A与平面ABC所成角的正切值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183512148423031/SYS201310241835121484230009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183512148423031/SYS201310241835121484230009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183512148423031/SYS201310241835121484230009_ST/1.png)
C.
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183512148423031/SYS201310241835121484230009_ST/3.png)
考点分析:
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<x<3
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直线l是双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183512148423031/SYS201310241835121484230007_ST/0.png)
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设f(n)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183512148423031/SYS201310241835121484230004_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183512148423031/SYS201310241835121484230004_ST/4.png)
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D.
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-
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