⑴已知
,若
为第二象限角,且
,求
的值;
⑵已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e5cbcbed232482cb24c5fba7391a6e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02215a92334ed014d8cd81f15a3229df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ba6b6ee00c4b2763cb3fa59caa69f.png)
⑵已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/536e072eb0439a5e5b430cd55a129374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ccca841a2565e0c552830365a09a9cc.png)
更新时间:2017-04-27 22:15:47
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