已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b177cfd06d2b74413c636c9f7abf54.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed115576ee2f374e145de97b5fa5ace.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5248ea408c8ff3a73c147d388fc8a2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b177cfd06d2b74413c636c9f7abf54.png)
更新时间:2023-03-23 16:30:24
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【知识点】 用和、差角的余弦公式化简、求值解读
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【推荐1】函数
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您最近一年使用:0次
填空题-单空题
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【推荐3】已知
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__________
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