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1 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e96fa21878e18e05d9edbadbe4b6ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6106c79c8f08bb2a84112d6bc1161d48.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-04-15更新
|
1748次组卷
|
6卷引用:甘肃省玉门油田第一中学2021-2022学年高一下学期期中考试数学试题
2023·全国·模拟预测
解题方法
2 . 已知
的内角
的对边分别为
,且
.
(1)求
;
(2)若点
,
,
均在边
上,且
,
平分
,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1187444ca7451b83a4acb9e4f444cb01.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0435f724a67b42436680115721cc3f1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76258acc3b26935a57b0e050216a2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856939d9867558190e863ba3f74abceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
您最近一年使用:0次
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解题方法
3 . 记
的内角A,B,C的对边分期为a,b,c,已知点D在边AC上,且
,
.
(1)证明:
是等腰三角形
(2)若
,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01476dfb5970e27f54f742c27b9515f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448066668f6d1eed9bce63b1f486157f.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f450f5ce2ecf8e546d16edaaa9bdb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
您最近一年使用:0次
2023-12-17更新
|
477次组卷
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3卷引用:山东省青岛市莱西市2024届高三上学期教学质量检测(一)数学试题
解题方法
4 . 求值:
(1)若
,
,求
的值;
(2)设
,
,且
,求
的值.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f63dc02238b087ff47e9aa5bf6759d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a077ceccea768ed3c664d38d55242fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb47b2fb016a195bec36b559a982314b.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f102439ebd1efd422f04209ecec2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b9082ee8dab6c1e4e325c9db6b9f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e21f77981ca14e82a9091f7b2571f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db796b223b35e52aa7b4114da8072f5.png)
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5 . 对集合
和常数
,把
定义为集合
相对于
的“正弦方差",则集合
相对于
的“正弦方差”为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72d0bd897d7f69292603c2db0d610fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856f92add36be3664c4214d045316dc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b72d0bd897d7f69292603c2db0d610fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61b9adf8aaf09c2d579190fe09f30d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.与![]() |
您最近一年使用:0次
2021-08-15更新
|
469次组卷
|
5卷引用:安徽省宿州市十三所重点中学2020-2021学年高二下学期期中文科数学试题
安徽省宿州市十三所重点中学2020-2021学年高二下学期期中文科数学试题江西省景德镇一中2021-2022学年高二下学期期中考试数学(文)试题(已下线)2020年高考北京数学高考真题变式题6-10题(已下线)第四章 三角函数与解三角形 专题 12 三角恒等变换中的求值问题 高中数学优质试题一题多解和变式训练(已下线)压轴题三角函数新定义题(九省联考第19题模式)练
名校
6 . 已知函数
,若其图象是由
图象向左平移
(
)个单位得到,则
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd1e86129b4daa1ff448e3cfc4057bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325f9e2f7784ebdd64292e805884dfa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e04b2fa62cb0e22d7268848987abc0c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-01-18更新
|
973次组卷
|
2卷引用:【全国百强校】山东省聊城市第一中学2019届高三上学期期中考试数学(理)试题