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四棱柱ABCD-A1B1C1D1中,底面ABCD是正方形,BB1⊥面ABCD,A...
四棱柱ABCD-A1B1C1D1中,底面ABCD是正方形,BB1⊥面ABCD,AB=2,BB1=4,则BB1与平面ACD1所成角的余弦值为 .
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的夹角的取值范围是
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C.5个
D.6个
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设平面向量
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=(x
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1),
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1y
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,
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,
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,则下列说法错误的是( )
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⊙
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)+(
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⊙
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)=0
B.存在非零向量a,b同时满足
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⊙
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=0且
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•
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=0
C.(
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+
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)⊙
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=
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⊙
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+
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⊙
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D.|
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|
2=|
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2|
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2-|
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2
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(a>0,b>0)的右焦点为F,左,右顶点分别为A
1,A
2.过F且与双曲线C的一条渐近线平行的直线l与另一条渐近线相交于P,若P恰好在以A
1A
2为直径的圆上,则双曲线C的离心率为( )
A.
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B.2
C.
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D.3
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