解题方法
1 . 已知在平面直角坐标系
中,角
的终边经过点
,且
.
(1)求
;
(2)当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4ec8f6ddacb9bbc238ebb0d85034de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/110d772c37f2c23513fda1d60ce5e690.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4c78214e43a8b93f2a57072033cbcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637a63ee6112047c05c7094e3a643d2d.png)
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解题方法
2 . 已知角
的终边经过点
,且
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82c6f0edfbd13616d08bd3380b8f41e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f903c7e790b4323eecd33e88c7f9e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a282d19bf2c827a98d4443330f7ca1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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