利用两角和(差)的余弦公式化简:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee2e3da911d205e7f2fdc6c71723c383.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6617af5910cf46922f2f71a1a89d1378.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40937278f0c9fd281dbca8ad14279d7b.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d624a5c3fe6008da916795251791a5.png)
20-21高一·全国·课后作业 查看更多[2]
更新时间:2021-11-11 18:46:22
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