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binhk5429
2 năm trước
Cho mình hỏi tại sao tập xác định của hàm số thứ 2 lại ra là 5π/3 + k2π vậy . Mình giải đi giải lại nhiều lần rồi mà vẫn ra là 2π/3 + k2π ấy
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