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Solve Helmholtz Equation : Bessel's Equations

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A)Solve the Helmholtz equation when u is a function of r only in 2-D.
b)Solve the Helmholtz equation when u is a function of r only in 3-D.
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Bessel's equations are used to solve Helmholtz equations. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.

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