20-21高一·全国·课后作业
1 . 证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f8b196bc82c1f270592880b42b9217.png)
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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)
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