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Physics, 15.07.2021 17:10 artic0203

một vật dao động điều hòa với phương trình x = 10cost( pi t - pi/4 ) cm. thời điểm thứ 2018 vật qua vị trí với tốc độ bằng 5pi m/s là ? Ai biết chỉ mình với ạ

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