From 24a794c7c151f4ccab208a9c48c97657dda646e0 Mon Sep 17 00:00:00 2001
From: Ondrej Certik <ondrej@certik.cz>
Date: Wed, 5 Mar 2008 07:04:53 +0100
Subject: [PATCH] A little polishing of the Pow._eval_evalf().

---
 sympy/core/power.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sympy/core/power.py b/sympy/core/power.py
index 57061f7..b526dad 100644
--- a/sympy/core/power.py
+++ b/sympy/core/power.py
@@ -399,8 +399,8 @@ class Pow(Basic, ArithMeths, RelMeths):
         base = base.evalf()
         exp = exp.evalf()
 
-        if exp < 0 and base.has(S.ImaginaryUnit):
-            base = base.conjugate() / (base * base.conjugate()).evalf().evalf()
+        if exp < 0 and not base.is_real:
+            base = base.conjugate() / (base * base.conjugate()).evalf()
             exp = -exp
 
         return (base ** exp).expand()
-- 
2.11.4.GIT