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1 . 如图,在正方体ABCD﹣A1B1C1D1中,直线A1C与平面ABCD所成角的余弦值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/b9882877-70e0-4344-8af4-e920ebe1dbfe.png?resizew=134)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/b9882877-70e0-4344-8af4-e920ebe1dbfe.png?resizew=134)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 如图,四边形ABCD为矩形,沿AC将△ADC翻折成
.设二面角
的平面角为
,直线
与直线BC所成角为
,直线
与平面ABC所成角为
,当
为锐角时,有
![](https://img.xkw.com/dksih/QBM/2018/11/19/2078915588947968/2079126219956225/STEM/dcf554aa790b4d2f8802fe860645856a.png?resizew=268)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53f8441e5e499d705e4625e4c7db33dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd606081fe85a262777717651cabb82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f64fa38725c136504f723019a18dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93fa313adc4ac7608ba9449fd755212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2018/11/19/2078915588947968/2079126219956225/STEM/dcf554aa790b4d2f8802fe860645856a.png?resizew=268)
A.![]() | B.![]() | C.![]() | D.![]() |
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