X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Data%2FComplex.hs;fp=Data%2FComplex.hs;h=69655479c0d399f3cc3fadbabe122beb21275b88;hb=11a832d96a0109cdec05d8a23ff4a3d64959617b;hp=bbc8a07db2449f75bf26c1d70c9eb6eef4b74cb2;hpb=3541a11faa9cc6b8ca7063b7e6421cb0385997fa;p=ghc-base.git

diff --git a/Data/Complex.hs b/Data/Complex.hs
index bbc8a07..6965547 100644
--- a/Data/Complex.hs
+++ b/Data/Complex.hs
@@ -198,4 +198,4 @@ instance  (RealFloat a) => Floating (Complex a) where
 
     asinh z        =  log (z + sqrt (1+z*z))
     acosh z        =  log (z + (z+1) * sqrt ((z-1)/(z+1)))
-    atanh z        =  log ((1+z) / sqrt (1-z*z))
+    atanh z        =  0.5 * log ((1.0+z) / (1.0-z))