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diff --git a/src/c/elementaryFunctions/asec/dasecs.c b/src/c/elementaryFunctions/asec/dasecs.c
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+// Copyright (C) 2017 - IIT Bombay - FOSSEE
+//
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+// Organization: FOSSEE, IIT Bombay
+// Author: Ashish Kamble
+// Email: toolbox@scilab.in
+#include <math.h>
+#include "asec.h"
+
+double dasecs(double x) 
+{
+ return  acos(1/x);
+}