1 . 求证:
(1)
.
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45f8883d82e95c8cd9493f85b3c67746.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6668303fba26fff5a383550bbe9d7f.png)
您最近一年使用:0次
2 . 已知在
中,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e24b6bee725576711a918d30ab06cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f296989add06c4bc2207a20b0746e533.png)
您最近一年使用:0次
2020-02-03更新
|
439次组卷
|
2卷引用:第五章 三角函数 5.5 三角恒等变换 5.5.2 简单的三角恒等变换