k ( a2u + _!_au ) = au ; ar2 r ar at u = e-ka2t(c110(ar) + c2Y0(ar))
Chapter 13, Problem 27(choose chapter or problem)
k ( a2u + _!_au ) = au ; ar2 r ar at u = e-ka2t(c110(ar) + c2Y0(ar))
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