M
ms.sun
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
giải phương trình :
[TEX]sin3x=cos3xcosx(tan^2x+cotx)[/TEX]
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[TEX]sin3x=cos3xcosx(tan^2x+cotx)[/TEX]
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