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[" (1) "y=Ae^(-kt)cos(rho t+c),PT(d^(2)U...

[" (1) "y=Ae^(-kt)cos(rho t+c),PT(d^(2)U)/(dx^(2))+2k(dy)/(dt)+n^(2)y],[" Where "n^(2)=rho^(2)+k^(2)]

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