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NAME
    asec - inverse trigonometric secant

SYNOPSIS
    asec(x [,eps])

TYPES
    x		real, with absolute value >= 1
    eps		nonzero real, defaults to epsilon()

    return	real

DESCRIPTION
    Returns the asec of x to a multiple of eps with error less in
    absolute value than .75 * eps.

    v = asec(x) is the number in [0, pi] for which sec(v) = x.

EXAMPLE
    ; print asec(2, 1e-5), asec(2, 1e-10), asec(2, 1e-15), asec(2, 1e-20)
    1.0472 1.0471975512 1.047197551196598 1.04719755119659774615

LIMITS
    none

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

SEE ALSO
    asin, acos, atan, acsc, acot, epsilon

## Copyright (C) 1999  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.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: asec,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/asec,v $
##
## 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/