diff -Nur libaffa-0.9.6/src/aa_aaf.h libaffa-0.9.6-new/src/aa_aaf.h
--- libaffa-0.9.6/src/aa_aaf.h	2006-06-23 04:59:19.000000000 -0300
+++ libaffa-0.9.6-new/src/aa_aaf.h	2009-09-08 09:39:52.000000000 -0300
@@ -126,7 +126,7 @@
 AAF pow(const AAF & P, double exp);
 AAF cos(const AAF & P);
 AAF tan(const AAF & P);
-AAF cotan(const AAF);
+AAF cotan(const AAF & P);
 
 AAF cosh(const AAF & P);
 AAF sinh(const AAF & P);
