Question: Problem with dsolve and evalf


I'm quite new in Maple and stuck at one point. I think it is a trivial but I'm stuck anyways and hope somebody could help me here.

Following the DE system i'd like to be solved.

Following the -simplified- f2(x) maple founds.

And this is what i get when i use evalf: (evalf(f2(5,11))

Why I don't get a numeric result? Actually, I care about the real part so how can I get rid of the complex part?


Thanks in advance...

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