解题方法
1 . (1)化简:
(
为第二象限角);
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c60f28ca949e46f9f537c9a6786bfc1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e96bd826e187735177986d3ec72e3ce.png)
您最近一年使用:0次
名校
解题方法
2 . (1)已知
,且
为第二象限的角,求
、
的值;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a892dbcef7934d97016bb190d94e0bc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a753b959d5cb8e214ffd3731935ed7d.png)
您最近一年使用:0次