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thai_9000
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
[tex]sinx + siny +sin(x+y)=\frac{3\sqrt{3}}{2}[/tex]
(3*căn bậc 2 của 3):2 thong cam minh van ko biet cach go cong thuc toan![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
(3*căn bậc 2 của 3):2 thong cam minh van ko biet cach go cong thuc toan
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