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![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
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1.[TEX]4sin^3 x.cos3x[/TEX] + [TEX]4cos^3 x.sin3x[/TEX] + 3[tex]\sqrt{3} cos4x = 3[/tex]
2. [TEX]2cos3x(2cos2x + 1)=1[/TEX]
2. [TEX]2cos3x(2cos2x + 1)=1[/TEX]
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