Hello all, I'm trying to prove to myself that the following solution to the DE shown works. I can't start using it until i prove to my self it works (it's this psycological thing i have were i can't use anything unless i know where it comes from). :rofl: Here is the Equation and it's solution http://img142.imageshack.us/img142/3437/defa7.png [Broken] and here is me trying to prove to my self it works... http://img137.imageshack.us/img137/1831/desolhv6.png [Broken] Am I doing anything wrong? Or can anyone please show me a proof which shows that this is a solution to the Differential Equation? Thanks in advance edit: I don't think this is a homework question, as you know, im just trying to prove it to my self.