A . y=Acos(2πt/T-2πx/λ-1/2π)B . y=Acos(2πt/T+2πx/λ+1/2π)C . y=Acos(2πt/T+2πx/λ-1/2π)D . y=Acos(2πt/T-2πx/λ+1/2π)
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