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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?