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minkim297
2 năm trước
Trên đường tròn lượng giác cho điểm M xác định bởi số đo AM = -70 độ với A(1; 0). Gọi M1 là điểm đối xứng của M qua đường phân giác của góc phần tư thứ I. Số đo của cung lượng giác AM1
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