21-22高一·全国·课后作业
1 . 判断正误.
(1)两角和与差的余弦公式中角
是任意的.( )
(2)
一定不成立.( )
(3)
.( )
(4)
三者知二可表示或求出第三个.( )
(5)
能根据公式
直接展开.( )
(6)存在
,使
成立.( )
(1)两角和与差的余弦公式中角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045368662212309d776c11dce5ff5ee3.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1c3aad8e13923416b495a8088ae1297.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/704d84df3a23125ab16d65da1a4fd850.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d0d9fbea26aefffa961a176bcbd125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c1f914da4657eca7865982b130b299.png)
(6)存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5c6c8a83373aa91df3592b98a274ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456fcc5a69b84c848f5ccf0ba75ffec6.png)
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