First-Order Solution Methods Playlist (separation, integrating factor, method of undetermined coefficients)
First Order Solution Techniques - YouTube
Derivation of the integrating factor method
MATH235 - Integrating Factor Derivation
Bernoulli transformation
Bernoulli Transformation - YouTube
https://www.youtube.com/playlist?list=PLfzyv9XksyEc5jwqzsAggDqaCMwk4lgS5