I'm sorry the question is in english ,I don't know how to use the equation compiler.
2026-04-06 20:46:53.1775508413
If laplacian of $f(r)= f''(r) + (2/r)f'(r)$, find $f(r)$ such that $\mathcal{L}[f(r)] = 0$
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HINT
You just have to solve $$ u' + (2/r)u = 0, $$
which can be done by integrating factor and use $f' = u$.