Ord diff eq: Integrating factor?

From: "Sarah L" <dani4965@xxxxxxxxxxxxx>
Date: Wed, 23 Aug 2006 21:36:11 +0200

Hi everyone!
The ordinary diff. equation y^2 dx + (e^x - y) dy = 0
is supposed to have an integrating factor on the form f( y e^x ).
Does anyone know how to find this?
I would be so grateful if anyone could tell me how, I'm getting desperate...

/ Sarah

.

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