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diff --git a/2.3-1/src/c/elementaryFunctions/includes/tan.h b/2.3-1/src/c/elementaryFunctions/includes/tan.h
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2006-2008 - INRIA - Bruno JOFRET
+ *
+ *  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 __TAN_H__
+#define __TAN_H__
+
+#include "dynlib_elementaryfunctions.h"
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+/*
+** Compute Tangeant for different types .
+*/
+
+/*
+** \brief Float Tangeant function
+** \param in : input value.
+*/
+EXTERN_ELEMFUNCT float		stans(float in);
+
+/*
+** \brief Double Tangeant function
+** \param in : input value.
+*/
+EXTERN_ELEMFUNCT double		dtans(double in);
+
+/*
+** \brief Float Complex Tangeant function
+** \param in : input value.
+*/
+EXTERN_ELEMFUNCT floatComplex	ctans(floatComplex in);
+
+/*
+** \brief Double Complex Tangeant function
+** \param in : input value.
+*/
+EXTERN_ELEMFUNCT doubleComplex	ztans(doubleComplex in);
+
+/*
+** \brief Float Matrix Tangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+EXTERN_ELEMFUNCT void		stana(float* in, int size, float* out);
+
+/*
+** \brief Double Matrix Tangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+EXTERN_ELEMFUNCT void		dtana(double* in, int size, double* out);
+
+/*
+** \brief Float Complex Matrix Tangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+EXTERN_ELEMFUNCT void		ctana(floatComplex* in, int size, floatComplex* out);
+
+/*
+** \brief Double Complex Matrix Tangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+EXTERN_ELEMFUNCT void		ztana(doubleComplex* in, int size, doubleComplex* out);
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+
+#endif /* !__TAN_H__ */
+