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mycrushiscloud
2 năm trước
một vật tham gia đồng thời hai dao động điều hòa cùng phương có ptr làn lượt là x1=9cos(wt+phi1), x2=A2cos(wt+phi2) .biết biên độ tổng hợp là 15 cm và khi x1=0 thì x2=A2.tìm A2
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