如图,在平面直角坐标系
中,以
轴为始边作两锐角
,
,它们的终边分别与单位圆交于
,
两点,且
,
的横坐标分别为
,
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b96754743b4a2d1e7b55598af708344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69d166677557cadb3da32b4a7e152e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfea1e888676a13ad69c72fba0405ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/2e76843b-b600-4275-bf06-e6185da66e10.png?resizew=149)
更新时间:2024-04-02 21:36:52
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】已知角
的顶点为坐标原点
,始边与
轴正半轴重合,终边上有一点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bec550c01b4f075f22ab67f5e55ed5d.png)
,且
,
.
(1)求
,
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bec550c01b4f075f22ab67f5e55ed5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/396f2055f52c0c2ce16a6d456df2ae51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b759611100b2fb7cfe2f1049a52e41.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99bca5512bfd9077a4e186deb258a7c3.png)
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【推荐2】已知角α的终边过点(﹣3,﹣4).
(1)求sinα,cosα的值;
(2)求
的值.
(1)求sinα,cosα的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4c8ee5eb949d223fafcd83f08adc1f.png)
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适中
(0.65)
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解题方法
【推荐1】如图,设
的内角A,B,C所对的边分别为a,b,c,记
的面积为S.其中
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e263c85e-69a3-44f6-9030-85459648e557.png?resizew=149)
(1)求角B的大小和
的值;
(2)设D为B边上的一点且
,若
的面积为14,求AD的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13171ee1bcd5648ed7c5ad56dd63942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf1294f6a9b3b2759e6c478a69fc62e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/e263c85e-69a3-44f6-9030-85459648e557.png?resizew=149)
(1)求角B的大小和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
(2)设D为B边上的一点且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e75d7342e6f087370d09181b17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知
,
,
是第三象限角,
.求:
(1)
的值;
(2)
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b7913fc416becdf5fbf7fb8884fa8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4cd1a58c415ccd581d0cf38d28949a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f65044c12d07e5f37b5e0e68d9f5af.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146fc0a63e5c14a8fa46573e60c07ba.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdebcc0cfa748da7c8419d9509048161.png)
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解题方法
【推荐1】已知函数
.
(1)求函数
的对称中心;
(2)若
,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20150a5ca44cf538bef6ffc4e989de84.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f55b8836b41be612a52ca9caf97006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e8e5eaaa5dcd051c9b4ad80c15406a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87418bb3f37283fbec48387b07444cb.png)
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【推荐2】已知函数
.
(1)求
的单调递增区间.
(2)在ΔABC中,角A,B,C所对的边分别为a,b,c,若f(A)=1,c=10,cosB=
,求ΔABC的中线AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eccfe5f88ac5df2ffc39ad65dee6032.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)在ΔABC中,角A,B,C所对的边分别为a,b,c,若f(A)=1,c=10,cosB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】已知平面四边形
内接于圆
,且
.
(1)求角
的大小;
(2)若
,求四边形
面积
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2131a3439d5544258040a9649b3c9e98.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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【推荐2】已知
,
.如果定义
.
(1)求
的单调递增区间;
(2)在△ABC中,角A,B,C的对边分别是a,b,c.若
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866aca7d179ab2d71d64e47799e87d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d7dd598acb987a6927ce117723f678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ebdcb4bdfdb13b83dfc2c1d2d074e86.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)在△ABC中,角A,B,C的对边分别是a,b,c.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ff2967de698893ba6afa8968236cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07389797744daa77fe1cb5cc237d25df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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