Sympy geometry: can't compute tangent lines
Here's the problem:
from sympy import symbols, Plot from sympy.geometry import * c1 = Circle(Point(0,0),2) a = Point(3,0) at = c1.tangent_lines(a) DomainError: can't compute a Groebner basis over RR
A little web search indicates that this was a problem with older versions of sympy, but Sage includes a newer version for which this issue is not supposed to be a problem. Any ideas on how to get round this?