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- Thread starter wmccunes
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- Thread starter
- #1

- Feb 13, 2012

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With simple steps Yoy arrive to write...I haven't done ODEs in a while nor have a book handing.

How do I tackle an equation of the form

\[

2xyy'=-x^2-y^2

\]

I tried polar but that didn't seem to work.

$\displaystyle (x^{2} + y^{2})\ dx + 2\ x\ y\ d y =0\ (1)$

... and the expression (1) is an 'exact differential'...

Kind regards

$\chi$ $\sigma$

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