$ \cos 2x (3\sin x - 1)  + 6 sin^{2}(x - \frac{\pi }{4} ) \cos x = 1 + 3\cos x $

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 01:33 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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