如图,AE⊥平面ABCD,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fd4ce957dc0d1e8740861e8910647f.png)
(2)求直线CE与平面BDE所成角的正弦值:
(3)求平面BDE与平面BDF夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8062605fdc0cc0216c97391adf9dc930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fd4ce957dc0d1e8740861e8910647f.png)
(2)求直线CE与平面BDE所成角的正弦值:
(3)求平面BDE与平面BDF夹角的余弦值.
更新时间:2022-05-31 07:27:49
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【推荐1】如图,在边长为2的正方体
中,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/09bdd5a7-d99f-44cd-aa3a-8a82db30d7b6.png?resizew=165)
(1)求证:
平面
;
(2)求直线
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/09bdd5a7-d99f-44cd-aa3a-8a82db30d7b6.png?resizew=165)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd597851c0db4e4de4769e10e09383b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
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【推荐2】如图:在正方体ABCD-A1B1C1D1中,E为DD1的中点,点G,F分别是线段BD,EC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/9380bbc8-4e3e-4d24-ae09-ed678888a3e6.png?resizew=147)
(1)求证:GF//平面AED
(2)若BD1=
,求三棱锥E-ACD的体积
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/9380bbc8-4e3e-4d24-ae09-ed678888a3e6.png?resizew=147)
(1)求证:GF//平面AED
(2)若BD1=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
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【推荐1】如图,在三棱台
中,
,
平面
,且
为
中点.
(1)证明:
平面
;
(2)若
,求此时直线
和平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/26/4fbfbc3f-e005-4783-a9e9-24cba3b354a7.png?resizew=153)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfb3f0b5d8bf98eeff66f43b7dcbb4be.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c596aff6331566a0149449183c2024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74bca84ad86c648d3bb20c8909c8da3f.png)
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【推荐2】如图,在三棱锥
中,
和
都是等腰直角三角形,且
,
,二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d3b3486a-2376-4568-a6d2-d2c7033c6403.png?resizew=172)
(1)求证:直线AB与直线PC不垂直;
(2)求直线PB与平面ABC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4b13964019381c4cd9de05f95c4261b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6d33fef1ed59100e8d6dfccb1c6e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d3b3486a-2376-4568-a6d2-d2c7033c6403.png?resizew=172)
(1)求证:直线AB与直线PC不垂直;
(2)求直线PB与平面ABC所成角的正弦值.
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【推荐1】如图,在四棱锥
中,
平面ABCD,四边形ABCD为正方形,
,F,E分别是PB,PC的中点.
;
(2)求平面ADEF与平面PCD的夹角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828d70017e2681ddc069b7a856796c6b.png)
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(2)求平面ADEF与平面PCD的夹角.
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【推荐2】如图,已知四棱锥
的底面
是平行四边形,
,
,
,
,平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
底面
,直线
与底面
所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/87c83e5c-68d3-4999-9b5b-a1defbf9a3c0.png?resizew=217)
(1)证明:平面
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ae16b72924eb24c45f5dcfab07cc01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/26/87c83e5c-68d3-4999-9b5b-a1defbf9a3c0.png?resizew=217)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
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