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In this video I will explain the steps used to find u=f(x,y)=? if the 1st order partial differential equation, PDE, contain both partial(u)/partial(x)) and partial(u)/partial(y). We have solve the PDE by assuming we can find u(x,y)=f(p) where f(p)=g(x,y) and p is the integrating factor.

Next video in this series can be seen at:
https://youtu.be/oMN9koGNTmc