已知点
,点
是单位圆上的任意一点,
.
(1)若点
的横坐标为
,求
的值;
(2)若
是锐角,且
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec6ce73c6786d50028addff089bbb64.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8e3ed4652d56b8f086d7f94707060a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f5875c2e91cf00419937685cbe79bea.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f058f3ebb0b297e2b9dd905f2047f930.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e094f5ed5a123f1e6525699ce14dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3ce22382b268b8197502a1d5eaf883.png)
更新时间:2017-05-18 00:23:17
|
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解答题-问答题
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适中
(0.65)
名校
【推荐1】如图,在直角坐标系
中,点
是单位圆上的动点,过点
作
轴的垂线与射线
交于点
(
在
的上方),将始边与
轴的正半轴重合,且终边在射线
上的角记为
;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/6018d014-d560-4b3f-91f5-f6a80be7ee8c.png?resizew=150)
(1)用
表示
的坐标;
(2)当
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面积有最大值?并求出
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cb9d2058893e48e228f078cd1de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187a10dd24462c289fe2709d4a9f4cf7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/6018d014-d560-4b3f-91f5-f6a80be7ee8c.png?resizew=150)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45b8b000c9c286bff8a480dbf03b513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45b8b000c9c286bff8a480dbf03b513.png)
您最近一年使用:0次
解答题-问答题
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适中
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解题方法
【推荐2】如图,在平面直角坐标系xOy中,以Ox轴为始边作两个锐角
、
,它们的终边分别与单位圆相交于A、B两点,已知A、B的纵坐标分别为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/a8cde2f7-6bed-48f0-8fef-77da4c2e772b.png?resizew=146)
(1)求
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(2)求
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![](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/d83fb9ac8a18e78a4c56da79514b5ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd92f594c348f7a956607f7b381cc22a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/a8cde2f7-6bed-48f0-8fef-77da4c2e772b.png?resizew=146)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c1f914da4657eca7865982b130b299.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3172c2372621fe71ae7ce2c51d26eb8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146fc0a63e5c14a8fa46573e60c07ba.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dd671cde86df61a9e582de219df759.png)
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解答题-问答题
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适中
(0.65)
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解题方法
【推荐1】已知
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,
,
.
(1)求
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(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4115a07822d1efdc5f8ce1cc78b7da29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da796c1f3d5f38959315d1f92dacdce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b7c767467b763994dd5116257ba243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8e0548d98e1c2fa1fe1908538d77cb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3c175632b88ffa1c28518cf2596061.png)
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【推荐2】如图,在扇形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826fa702e700b8536f77e44b134ce334.png)
您最近一年使用:0次