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diff --git a/src/elementaryFunctions/includes/atan2.h b/src/elementaryFunctions/includes/atan2.h
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2008-2008 - INRIA - Allan SIMON
+ *
+ *  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
+ *
+ */
+
+#ifndef __ATAN2_H__
+#define __ATAN2_H__
+
+#include "floatComplex.h"
+#include "doubleComplex.h"
+#include <math.h>
+/*
+** Compute arctan with two parameters  .
+*/
+
+
+/*
+** \brief Float arc tangent function
+*/
+float satan2s  ( float x , float y );
+
+/*
+** \brief Double arc tangent function
+*/
+double datan2s ( double x , double y);
+
+
+/*
+** \brief array's Float arc tangent function 
+*/
+void satan2a (float* in1, int size1, float* in2, int size2, float* out) ; 
+
+/*
+** \brief array's Double arc tangent function 
+*/
+void datan2a (double* in1, int size1, double* in2, int size2, double* out) ;
+
+
+
+
+#endif /* !__EXP10_H__ */