| Sage Version 4.8, Release Date: 2012-01-20                         |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: m=sqrt(sin(pi/5))
sage: m.minpoly() # works
x^8 - 5/4*x^4 + 5/16
sage: QQbar(m).minpoly() # works
x^8 - 5/4*x^4 + 5/16
sage: AA(m).minpoly() # does not work
 ...
 <snip>
 ...
TypeError: Unable to convert number to real interval.