21-22高一·全国·课后作业
解题方法
1 . 若
,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a51be91a825637d9f9f53f4bffa7a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf7e2ed7b1158342d90aea73f98dbc1.png)
A.cos α-sin α | B.cos α+sin α |
C.-cos α+sin α | D.-cos α-sin α |
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