已知
, 计算:
(1)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44009a8e1193162d6e135ee32c30020a.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/578853e3cd49b1a7c80ab6d1e507ba22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1003b8fda9043716ac703ba79fb8bbec.png)
2010高一下·河南焦作·专题练习 查看更多[2]
更新时间:2016-11-30 06:31:23
|
【知识点】 两角和与差的三角函数解读
相似题推荐
解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】已知
,
.
(1)求
的值;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70512172433e96ff710dd67a23faf286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40553ae3056af82bcaf1fb8923337f09.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/affef976aac53a7783108bd132cef3c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175c73225fb453814c489638d6ef33bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f798a9af75a091a8be0b71f2038260.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐2】已知
,
,其中
,
.
(1)求
的值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dab78aefa6aa5a889081ebe73f6580d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebdd6155a995158f85bd39a7d1d79add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04515cee3fcef6932e8406ed1001abcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63130bdbac5daa62fba51715ad804220.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d13daac09de9fe134b126107e3fe654b.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f8481c483bb605f505414fde3c6a8d.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐3】在
中,角A,B,C的对边分别为a,b,c,
,且
.
(1)判断
的形状;
(2)若
在边
上,且
,
,以
和
为边,向外作两个正方形,求这两个正方形面积和的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503132521af12ec028431a6010a74e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b1e717e9fc4481050672eec8ac5c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次