1 . 判断正误(正确的填写“正确”,错误的填写“错误”)
(1)两角和与差的正弦、余弦公式中的角α,β是任意的.( )
(2)存在
,使得
成立.( )
(3)对于任意
,
都不成立.( )
(4)
.( )
(1)两角和与差的正弦、余弦公式中的角α,β是任意的.
(2)存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7170baf4e8fc6bf3dd518cc49bf736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b839269b506f3abcf4458ecd3a8cfd.png)
(3)对于任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7170baf4e8fc6bf3dd518cc49bf736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649c3008c4545c195e0f279606f881c9.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75124fba8b95791947cf8eff99a84630.png)
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解题方法
2 . 已知函数
.
(1)利用“五点法”,完成如下表格,并画出函数
在一个周期上的图象;
(2)若
且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd6dd6ff7442ffdd49ae72d99a76f4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/c80db8ee-6701-4031-8634-f7c18aeec9ac.png?resizew=183)
(1)利用“五点法”,完成如下表格,并画出函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![]() | _____ | _____ | _____ | _____ | _____ |
x | _____ | _____ | _____ | _____ | _____ |
![]() | _____ | _____ | _____ | _____ | _____ |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/612fd36aeb83099c4644c076db691612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8289af4a977f6e40f772cabbf3ed9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f90c4754e6b6fc862d72943fb35569.png)
您最近一年使用:0次