在
中,已知
,
,外接圆半径为
,点
分别是
的三等分点(
),
与
相交于点
,则
的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e5bc54c6b47e316a542735aff840ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e72b4868bdd8d15dff2211cc49cd31b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881068127a39caf319492b4177204f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e815c0da8c18685343108220a3fff175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a814303dd703d9068b364f317c14d96e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-06-17 21:15:17
|
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【推荐1】已知圆锥PO的高及底面圆直径均为2,若圆锥PO在球
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f40d5459e1385ab7d829ea96ca0b946.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45cc81cfaccc00aa4b7139de5a35a102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d532ce76942846df88c6f66112e50f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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适中
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解题方法
【推荐1】已知四边形
,
,
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,
与
交于点
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,
,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec70816ad7a68d5be305d454b25a3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23fe796146684d601110a8bf3705a8a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f239bdb36d04fa97b2463145ce49d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0b20ee14331770e14fb151b0d75f7d.png)
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【推荐2】如图是改革开放四十周年大型展览的展馆﹣﹣国家博物馆.现欲测量博物馆正门柱楼顶部一点P离地面的高度OP点O在柱楼底部).在地面上的两点A、B测得点P的仰角分别为30°,45°,且∠ABO=60°,AB=50米,则OP为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/e6c8a26f-7237-4ec5-a276-0a837c558225.png?resizew=233)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/e6c8a26f-7237-4ec5-a276-0a837c558225.png?resizew=233)
A.15米 | B.25米 | C.35米 | D.45米 |
您最近一年使用:0次
单选题
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适中
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【推荐1】已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/242180b3fe252014448a197955d79490.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】在
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