Diff equations: about _t38

[parisse]

You can indeed solve for t in x=the first coordinate of the parametric solution and get y as a function of x, but this can not be done in general for an homogeneous differential equation. The first two solutions are particular solutions, they are complex here therefore you can omit them if you solve in the real domain, but this is not true in general.

[Edit]
I'm going to add code to try solving for t in x and remove non real singular solutions (in real mode).