已知
,且
为第三象限的角,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151801b91dfe213a5bf6108f1e5f8f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e304cf018473bb54edb166fcd6502b.png)
更新时间:2023-03-19 23:29:58
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【知识点】 三角函数的化简、求值——同角三角函数基本关系解读