5
5hienbede
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
[tex]1) 3cos^2x+2sin^2x=3cosx+2sinx[/tex]
[tex]2) 3(1+\frac{cos2x}{cos^2x})^4+tan^6x=7[/tex]
[tex]2) 3(1+\frac{cos2x}{cos^2x})^4+tan^6x=7[/tex]
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