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stoliver
2 năm trước
giúp mình với mình cần gấp, cám ơn ạ 1, nghiệm của pt cot^2x + 2cotx - 3 = 0 ? 2, nghiệm của pt cos2x+ cosx = 0 ? 3, sin 2x+ can3cos2x = 2sinx là?
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