From 8870e54e7c13b93412cfe7819a7b490a5264014f Mon Sep 17 00:00:00 2001
From: Martin Thoma <info@martin-thoma.de>
Date: Sun, 16 Sep 2012 12:11:48 +0200
Subject: [PATCH] fixed error in deriviate

---
 cheat-sheets/analysis/Analysis_Wichtige_Formeln.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cheat-sheets/analysis/Analysis_Wichtige_Formeln.tex b/cheat-sheets/analysis/Analysis_Wichtige_Formeln.tex
index dbe7345..e43440f 100644
--- a/cheat-sheets/analysis/Analysis_Wichtige_Formeln.tex
+++ b/cheat-sheets/analysis/Analysis_Wichtige_Formeln.tex
@@ -71,7 +71,7 @@ e^x &= \sum_{n = 0}^{\infty} \frac {x^n}{n!} \\
 	(\arctan x)' &= \frac {1}{1 + x^2} \\
 	(\sin x)'    &= \cos x \\
 	(\cos x)'    &= -\sin x \\
-	(\arctanh x)' &= \frac {1}{1 + x^2}
+	(\arctanh x)' &= \frac {1}{1 - x^2}
 \end{align*}