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