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diff --git a/src/c/elementaryFunctions/cosh/i16coshs.c b/src/c/elementaryFunctions/cosh/i16coshs.c
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+++ b/src/c/elementaryFunctions/cosh/i16coshs.c
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+/* Copyright (C) 2016 - 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
+ Author: Siddhesh Wani
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+
+/*
+//         cosh(z) = 0.5 (exp(|z|) + exp(-|z|))
+//                 = 0.5 ( y + 1/y ) with y = exp(|z|)
+*/
+
+#include <math.h>
+#include "cosh.h"
+#include "exp.h"
+#include "abs.h"
+#include "types.h"
+
+float	       i16coshs(int16 x) {
+  double y = i16exps(i16abss(x));
+  return (0.5 * (y + 1.0/y));
+}