Double integration for a differential equation with nested differentials

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enerj
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So my calculus isn't as sharp as I'd like it, and I am having trouble solving this diff eq, and I know the correct method is double integration. I also know the general solution to be

T(r) = A*ln(r) + B , A and B are constants

Thanks in advance
 
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  • Equation (1/r) d/dr (k r dT/dr) = 0, written as a typeset mathematical expression.
    2-5-2011 11-45-30 PM.png
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