From c81776e0377af9b0a6a0b0f78146dae37e842585 Mon Sep 17 00:00:00 2001
From: Benjamin Bertrand <lafrite@poneyworld.net>
Date: Sat, 27 Feb 2016 13:27:54 +0300
Subject: [PATCH] Solve bug with parenthesis and ^

---
 pymath/calculus/operator/pw.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/pymath/calculus/operator/pw.py b/pymath/calculus/operator/pw.py
index 8b8cbaa..5d2d1d3 100644
--- a/pymath/calculus/operator/pw.py
+++ b/pymath/calculus/operator/pw.py
@@ -19,7 +19,7 @@ class Pw(Operator):
     >>> pw.__tex__('2','-3')
     '2^{  -3 }'
     >>> pw.__tex__('-2','3')
-    '( -2 )^{  -3 }'
+    '( -2 )^{  3 }'
     >>> pw.__txt__('2','3')
     '2 ^ 3'
     >>> pw.__txt__('-2','3')
@@ -66,6 +66,19 @@ class Pw(Operator):
             ans = ' '.join([str(i) for i in ans])
         return ans
 
+    def __tex__(self, *args):
+        """Tex rendering for ^
+
+        :*args: Operands for this operation
+        :returns: String with operator and his operands
+
+        """
+        op1 = self.l_parenthesis(args[0], True)
+        op2 = args[1]
+        ans = self.tex.format(op1 = op1, op2 = op2)
+
+        return ans
+
 
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