已知角
终边落在直线
上,且
.
(1)则
是第___________象限角;
(2)
___________;
(3)求
的值;
(4)若
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a9b769d70cb6f29e965c800921c8ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddea0134685ce58a7a850ac8aa52aeb.png)
(1)则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43302b4a8061024ea62824d0c108f2ec.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfd58cba38252ee8cd82f2d983c836d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b9082ee8dab6c1e4e325c9db6b9f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eacde1c42151734fdc60f3001b590de.png)
更新时间:2022-05-02 12:05:27
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解答题-问答题
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【推荐1】已知锐角
的顶点在坐标原点,始边与
轴的非负半轴重合,终边与单位圆交于点
.
(1)求
的值;
(2)若锐角
满足
,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c4f45c7000140f48ba252cf4ddaf43.png)
(2)若锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabd534a0745c177bee146f0f3698721.png)
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您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,在直角坐标系中,设单位圆O与x轴的非负半轴相交于点
,以x轴的非负半轴为始边分别作任意角
,
,它们的终边分别与单位圆相交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/a11c83f7-4a15-43e3-9fda-c5c7e25e104a.png?resizew=185)
(1)请在图中作出以x轴的非负半轴为始边时角
的终边
(与单位圆交于点P),并说明AP与
的长度关系;
(2)根据第(1)问的发现,证明两角差的余弦公式;
(3)由两角差的余弦公式推导两角差的正弦公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8950c7bc835103d52ceffab14b6b31a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/a11c83f7-4a15-43e3-9fda-c5c7e25e104a.png?resizew=185)
(1)请在图中作出以x轴的非负半轴为始边时角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd927b4b5a7875528c1b54aa4bb8b2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae97d7f57b159b72a23eb909b74d7c3.png)
(2)根据第(1)问的发现,证明两角差的余弦公式;
(3)由两角差的余弦公式推导两角差的正弦公式.
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【推荐2】已知函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5d09f36dda6a23f87a760278223cf3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)
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解答题-问答题
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适中
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解题方法
【推荐1】锐角
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefce3cd40274cd7139ab35145884f23.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57fd422ff9a45a8d7bd87254b3c1f4d.png)
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解题方法
【推荐1】已知角
的顶点与原点O重合,始边与x轴非负半轴重合,它的终边过点
.
(1)求
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(2)若
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,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a963ab0a540bcb56b76027c748f38edb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146fc0a63e5c14a8fa46573e60c07ba.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4234175c2f92792ab2d298d45df37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/badecdaf694eed16e5c57de7c1359dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fe57d4fbae536de2e641d9d349fcf1.png)
您最近一年使用:0次