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PhDorBust

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I solve to get [tex]\frac{\partial V}{\partial u} = V_3(u)[/tex] and then [tex]V = \int V_3(u) du + C[/tex] Where V_3, C are arbitrary.

How could I transform my latter solution into the first solution? Don't V_1, V_2 have to have some properties such as differentiability? (I found this in a physics textbook)