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summertan

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14 years, 155 days

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These are answers submitted by summertan

Sorry that's not a bug, I just noticed I forgot the square of B(r) in the last term of the equation so it wasn't symmetric. When that is corrected, dsolve works for both A(r) and B(r) as expected.

Thanks, both suggestions work.

I've found it, use

 

alias(`f'`=D(f)(x+y));

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