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: [tex]\int f'(P)dP/(P-f(P))[/tex] I have 2 questions. How do I proceed, and when I do, is this going to involve the natural log of a Fourier transform?