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OpenStudy (anonymous):
radial solution to delta u + 4u = 0 in the ball b ={x, y, z} in R^3 : r = sqrt(x^2+y^2+z^2). I know v'' + 4v = 0 but I dont know how to get to the solution u =(Acosr)/r + (Bsinr)/r. It's well defined so A = 0
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