解题方法
1 . 已知
,且
是第二象限角,那么
的值为_____________
![](https://img.xkw.com/dksih/QBM/2016/9/27/1573044194058240/1573044200136704/STEM/c9d68167dc7549d4b0e904e6b6498232.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2016/9/27/1573044194058240/1573044200136704/STEM/4aab643cf61a4035a4ec87e0778b2f26.png?resizew=16)
![](https://img.xkw.com/dksih/QBM/2016/9/27/1573044194058240/1573044200136704/STEM/5754b277531943d3ace02287e830b11e.png?resizew=39)
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解题方法
2 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9933b50c2e009dd4a67a5e9b6946b0ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc903c19f7b3b0aa58cdb0cdb7b062a0.png)
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2012·陕西·模拟预测
3 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc79291472e4dba13dd9371e6b765458.png)
_____ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acab6da9e528ee1462c49d6fc431d320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc79291472e4dba13dd9371e6b765458.png)
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名校
解题方法
4 . 已知角
终边上一点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbdfecc9c61e22a29c06152a1415991b.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57f41842628a2f1138a9f0e7939fb20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbdfecc9c61e22a29c06152a1415991b.png)
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