已知
.
(1)化简
.
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9c5fee49071381800e173b4dfec780.png)
(1)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ba6b6ee00c4b2763cb3fa59caa69f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1258692e5acd95a659eaccb72e1a1951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ba6b6ee00c4b2763cb3fa59caa69f.png)
更新时间:2018-09-10 19:17:42
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【知识点】 三角函数的化简、求值——诱导公式解读