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Giải các phương trình bậc nhất
[TEX]1/ 3sin3x - \sqrt{3}cos9x = 1 + 4sin^3 3x[/TEX]
[TEX]2/ cos7xcos5x - \sqrt{3}sin2x = 1 - sin7xsin5x[/TEX]
[TEX] 3/ 2 \sqrt{2} ( sinx + cosx ) cosx = 3 + cos2x[/TEX]
[TEX]1/ 3sin3x - \sqrt{3}cos9x = 1 + 4sin^3 3x[/TEX]
[TEX]2/ cos7xcos5x - \sqrt{3}sin2x = 1 - sin7xsin5x[/TEX]
[TEX] 3/ 2 \sqrt{2} ( sinx + cosx ) cosx = 3 + cos2x[/TEX]