![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954016_ST/images0.png)
如图的多面体是底面为平行四边形的直四棱柱ABCD-A
1B
1C
1D
1,经平面AEFG所截后得到的图形.其中∠BAE=∠GAD=45°,AB=2AD=2,∠BAD=60°.
(1)求证:BD⊥平面ADG.
(2)求平面AEFG与平面ABCD所成锐二面角的余弦值.
考点分析:
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给出下列六个命题:
①
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/0.png)
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③“
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”的否定是:“∀x∈R,均有e
x≥0”;
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/2.png)
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;
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/5.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/6.png)
到直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954013_ST/7.png)
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