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i want to prove this equality:

it is trivial to show that it holds for all points outside small certain region around r=0

in this case both sides of equality are 0

i have a dificulty in proving the equality in region r~0

so please give some

it is trivial to show that it holds for all points outside small certain region around r=0

in this case both sides of equality are 0

i have a dificulty in proving the equality in region r~0

so please give some

**hint**how to attack this thing...
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