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Loga1808
2 năm trước
Giải các pt sau: $a, cos5x - sin3x = \sqrt{3}(cos3x - sin5x)$ $b, 3sin(x - \dfrac{\pi}{3}) + 4sin(x + \dfrac{\pi}{6}) + 5sin(x + \dfrac{\pi}{6}) = 0$
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