sympy/sympy — pull request #7878 by Tempel (2014-08-16 13:59:17+00:00)
Title: Fix #7814: Handle symbols in line-ellipse intersection.

I added one test for this, but it only runs to make sure no errors are raised. I do not have enough familiarity with the algorithm to know exactly what results are expected, but can add them if someone else can confirm what it should be.