K
kenlitu
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
[TEX]2sinx(cosx-1)[/TEX]=[TEX]\sqrt3[/TEX][TEX]cos2x[/TEX]
thanks trước ........................................
thanks trước ........................................
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