设
,
是第二象限角,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2390e2c0d9ca89342261c4c129f22bd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd502310c2b9ba14731f3d2f30b238e.png)
20-21高一·上海·假期作业 查看更多[1]
(已下线)专题08+二倍角与半角的余弦、正弦和正切-2020-2021学年新教材高一数学寒假辅导讲义(沪教版2020)
更新时间:2021-03-12 08:52:23
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9274fbafb4061b0c78bc42d5a634a022.png)
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