The error ended up being that I had tried to plot it in 3d first, which required the call q,x = var('q,x'), which messed up my calls to x later. At least, I think that was the cause. Either way, doing reset() fixed the problem. The error now is that apparently there's no convergence... it says "NoConvergence". If someone could try to run my code and see what the issue is, I would really appreciate it. Plotting 0 to .99 on Mathematica seems to work fine, I can't lose to my professor when I'm so close!
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