# Homework Help: Lagrange differential eq.

1. Apr 1, 2010

### jbowers9

1. The problem statement, all variables and given/known data

A Lagrange differential eq. represented as follows:

y = xf(y') + g(y')

Let y' = P
and after some fancy footwork;

dx/dP - xf'(P)/(P - f(P)) = g'(P)/(P - f(P)

2. Relevant equations

Now, the link that I got this from states that this is a 1st ode in standard form.
When I attempt to solve such I end up w/the following integrand:

$$\int f'(P)dP/(P-f(P))$$

I have 2 questions. How do I proceed, and when I do, is this going to involve the natural log of a Fourier transform?