M
mattroi_94
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![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Giải PT
[TEX]{sin}^{4}\frac{x}{2}-{cos}^{4}\frac{x}{2}=\left|sin\frac({x}/{2}) \right|+\left|cos\frac({x}/{2} )\right|[/TEX]![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Mong các bạn giúp mih
[TEX]{sin}^{4}\frac{x}{2}-{cos}^{4}\frac{x}{2}=\left|sin\frac({x}/{2}) \right|+\left|cos\frac({x}/{2} )\right|[/TEX]
Mong các bạn giúp mih