B
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![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
Giải pt:
1, 4sinx + 2cosx = 2+ 3tanx
2, [TEX] sinx.cos 2x[/TEX] =[TEX] sin 2x.cos3x -[/TEX] [TEX]\frac{1}{2}.sin5x[/TEX]
1, 4sinx + 2cosx = 2+ 3tanx
2, [TEX] sinx.cos 2x[/TEX] =[TEX] sin 2x.cos3x -[/TEX] [TEX]\frac{1}{2}.sin5x[/TEX]