I think another problem here is that Maxima is called at all. It happens
because the manifolds code naively compares two symbolic expressions via
'='. This invokes the full equality proof machinery, which is probably not
intended:

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/home/rllozes/sage-8.0/local/lib/python2.7/site-packages/sage/manifolds/coord_func_symb.py(673)__eq__()
671 return bool(other._express == self._express)
672 else:
--> 673 return bool(self._express == other)
674
675 def __neg__(self):
Rather, the line should read:
return (self._express - other).is_trivial_zero()
Regards,
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