把下列各式化为和或差的形式:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6bfc8b299cbd75c04e07bdf8fd0e97.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a5ce0330d68c299dcc9b264ac28713.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ea846b0143b00316f63b3aaf89f251.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b4f3d284bb41980d3c141059dd5abb.png)
20-21高一·全国·课后作业 查看更多[2]
更新时间:2021-11-11 23:11:41
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【推荐1】已知函数
.
(1)求函数
的最小正周期;
(2)求函数
在区间
上的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cc4bf8425bf59e7bb0bb6bd4b07baa.png)
(1)求函数
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(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐1】在锐角
中,角A,B,C的对边分别为a,b,c.从条件①:
;条件②:
;条件③:
这三个条件中选择一个作为已知条件.(注:若选择多个条件作答,则只按第一个解答计分)
(1)求角B的大小;
(2)若
,
的平分线BD交AC于点D,且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da43bb9890aa459342be25f78f2d0d3b.png)
(1)求角B的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42190fdb24c6e918e06eb4a2ebf8856f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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您最近一年使用:0次
解答题-问答题
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解题方法
【推荐2】在△ABC中,内角A,B,C所对的边分别为a,b,c.已知a=5,c=6,cos B=
.
(1)求b和sinA的值;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
(1)求b和sinA的值;
(2)求sin
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20086395532dac6250e729ef7da83cbb.png)
您最近一年使用:0次