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diff --git a/src/elementaryFunctions/includes/acos.h b/src/elementaryFunctions/includes/acos.h
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+/*
+**  -*- C -*-
+**
+** acos.h
+** Made by  Bruno JOFRET <bruno.jofret@inria.fr>
+**
+** Started on  Fri Jan  5 10:20:35 2007 jofret
+** Last update Fri Feb 23 16:38:45 2007 jofret
+**
+** Copyright INRIA 2007
+*/
+
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+/*
+** Compute ArcCosine for different types .
+*/
+
+/*
+** \brief Float ArcCosine function
+*/
+float		sacoss(float);
+
+/*
+** \brief Double ArcCosine function
+*/
+double		dacoss(double);
+
+/*
+** \brief Float Complex ArcCosine function
+*/
+floatComplex	cacoss(floatComplex);
+
+/*
+** \brief Double Complex ArcCosine function
+*/
+doubleComplex	zacoss(doubleComplex);
+
+/*
+** \brief Float Matrix ArcCosine function
+*/
+void		sacosa(float*, int, float*, int, int);
+
+/*
+** \brief Double Matrix ArcCosine function
+*/
+void		dacosa(double*, int, double*, int, int);
+
+/*
+** \brief Float Complex Matrix ArcCosine function
+*/
+void		cacosa(floatComplex*, int, floatComplex*, int, int);
+
+/*
+** \brief Double Complex Matrix ArcCosine function
+*/
+void		zacosa(doubleComplex*, int, doubleComplex*, int, int);
+
+