V
vietphuonga1
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
[Toán 11] Lượng giác
giai pt:[TEX]tan^2x+9cot^2x+(2cos2x+4)/sin2x=14[/TEX].thank nha
giai pt:[TEX]tan^2x+9cot^2x+(2cos2x+4)/sin2x=14[/TEX].thank nha
Last edited by a moderator: