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vyhao02
2 năm trước
Một chất điểm dao động điều hòa với phương trình x = 2cos(πt – π/2) cm. Khoảng thời gian ngắn nhất để vật đi qua vị trí có li độ x = √2 cm theo chiều dương lần đầu tiên kể từ thời điểm t = 1 s là
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