Question: Getting Rid of _F1, _F2, Etc., in the Solution of a PDE?

I am solving a PDE whose solution is the integrating factor MU of a given 1st order ODE. I get

I only need one of these solutions. How do I get rid of _F1? Can I make it to be the identity function? That is exactly what I need.

Thank you, as always!

mapleatha

 

 

 

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