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/* $NetBSD: ctanh.c,v 1.1 2007/08/20 16:01:38 drochner Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software written by Stephen L. Moshier.
* It is redistributed by the NetBSD Foundation by permission of the author.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* imported and modified include for newlib 2010/10/03
* Marco Atzeri <marco_atzeri@yahoo.it>
*/
/*
FUNCTION
<<ctanh>>, <<ctanf>>---complex hyperbolic tangent
INDEX
ctanh
INDEX
ctanhf
ANSI_SYNOPSIS
#include <complex.h>
double complex ctanh(double complex <[z]>);
float complex ctanhf(float complex <[z]>);
DESCRIPTION
These functions compute the complex hyperbolic tangent of <[z]>.
<<ctanhf>> is identical to <<ctanh>>, except that it performs
its calculations on <<floats complex>>.
RETURNS
These functions return the complex hyperbolic tangent value.
PORTABILITY
<<ctanh>> and <<ctanhf>> are ISO C99
QUICKREF
<<ctanh>> and <<ctanhf>> are ISO C99
*/
#include <complex.h>
#include <math.h>
double complex
ctanh(double complex z)
{
double complex w;
double x, y, d;
x = creal(z);
y = cimag(z);
d = cosh(2.0 * x) + cos(2.0 * y);
w = sinh(2.0 * x) / d + (sin(2.0 * y) / d) * I;
return w;
}
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