Question: Help a maple noob out with a numerical pendulum solution!

So I'm new to maple, more used to working in matlab. Anyway, I'm trying to solve the pendulum equation with a friction term, but the "dsolve" command spits out something I have no clue how to handle. What do I do with the "theta = _a & where [loads of bullshit]"? It's supposed to give me an integral of some sort that I can work with, not a strange substitution. Halp! 

 

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