已知
中角
,
,
所对的边分别为
,
,
,满足
.
![](https://img.xkw.com/dksih/QBM/2021/3/13/2677192822792192/2681074741772288/STEM/df7245a5-6406-4024-b856-b49d3bb86e6a.png?resizew=261)
(1)求
;
(2)若点
为
上一点,
,
,
平分
交
于点
,
,求
.
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f3fd9e42af86048ccf1ea39decbf2d.png)
![](https://img.xkw.com/dksih/QBM/2021/3/13/2677192822792192/2681074741772288/STEM/df7245a5-6406-4024-b856-b49d3bb86e6a.png?resizew=261)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ed75e65e7374c38ffb1f75259a8beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1af98f1fb74e141fe4652c337f27bc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e95e8ea2481642f47d867e8b9cb223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
21-22高三上·全国·阶段练习 查看更多[3]
(已下线)“超级全能生”2021届高三全国卷地区1月联考试题(丙卷)数学(理)试题(已下线)押第18题三角函数-备战2021年高考数学临考题号押题(浙江专用)云南省巍山彝族回族自治县第二中学2020-2021学年高一下学期第三次月考数学试题
更新时间:2021-03-19 08:43:26
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解题方法
【推荐1】已知锐角
分别为角
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(1)求证:
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(2)求
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(2)求
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【推荐2】如图,B,C分别是海岸线上的两个城市,两城市间由笔直的海滨公路相连,B,C之间的距离为100km,海岛A在城市B的正东方50
处.从海岛A到城市C,先乘船按北偏西θ角(
,其中锐角
的正切值为
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(1)试建立由A经P到C所用时间与
的函数解析式;
(2)试确定登陆点P的位置,使所用时间最少,并说明理由.
![](https://img.xkw.com/dksih/QBM/2018/1/31/1872448930963456/1873498952327168/STEM/a0f2535388684aa29e3c158e0e678d3b.png?resizew=16)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/340feb6fde2571dd72a9086213d01d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)试建立由A经P到C所用时间与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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![](https://img.xkw.com/dksih/QBM/2018/1/31/1872448930963456/1873498952327168/STEM/36b07adf26c64531a7db89289720270e.png?resizew=105)
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解答题-证明题
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【推荐1】如图,四边形
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/d33946a3-23d7-4bc0-8ff3-30bca62729c4.png?resizew=146)
(1)求证:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7355730155322ae2a9a0e397774b830a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/d33946a3-23d7-4bc0-8ff3-30bca62729c4.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90f7efe2f99f5cb6801841171feab6b.png)
(2)若△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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】如图,△
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://img.xkw.com/dksih/QBM/2020/1/6/2371478442205184/2371919528828928/STEM/c5cfee49972145c981d21f2655ea5bb4.png?resizew=148)
(1)若小路一端
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求分成的四边形的面积的最小值.
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