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ruoimuoilamot


Câu 1: 3 tan x + 2cot 3x = tan 2x
Câu 2:[TEX] sin^3x + cos^3x + \frac{1}{\sqrt{2}} sin 2x sin (x + frac{\Pi}{4}) = cos x + sin 3x[/TEX]
Câu 2:[TEX] sin^3x + cos^3x + \frac{1}{\sqrt{2}} sin 2x sin (x + frac{\Pi}{4}) = cos x + sin 3x[/TEX]