NAME
    csch - hyperbolic cosecant

SYNOPSIS
    csch(x [,eps])

TYPES
    x		nonzero real
    eps		nonzero real, defaults to epsilon()

    return	real

DESCRIPTION
    Calculate the csch of x to a multiple of epsilon, with error less in
    absolute value than .75 * eps.

    csch(x) = 2/(exp(x) - exp(-x))

EXAMPLE
    ; print csch(1, 1e-5), csch(1, 1e-10), csch(1, 1e-15), csch(1, 1e-20)
    0.85092 0.8509181282 0.850918128239322 0.85091812823932154513

LIMITS
    none

LINK LIBRARY
    NUMBER *qcsch(NUMBER *x, NUMBER *eps)

SEE ALSO
    sinh, cosh, tanh, sech, coth, epsilon

## Copyright (C) 1999,2021  Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL.  You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
##
## Under source code control:	1995/11/13 03:49:00
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/