NAME
    asin - inverse trigonometric sine

SYNOPSIS
    asin(x [,eps])

TYPES
    x		real, -1 <= x <= 1
    eps		nonzero real, defaults to epsilon()

    return	real

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

    v = asin(x) is the number in [-pi/2, pi/2] for which sin(v) = x.

EXAMPLE
    ; print asin(.5, 1e-5), asin(.5, 1e-10), asin(.5, 1e-15), asin(.5, 1e-20)
    .5236 .5235987756 .523598775598299 .52359877559829887308

LIMITS
    none

LINK LIBRARY
    NUMBER *qasin(NUMBER *q, NUMBER *epsilon)

SEE ALSO
    acos, atan, asec, 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.
## 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
##
## @(#) $Revision: 29.4 $
## @(#) $Id: asin,v 29.4 2006/05/07 07:25:46 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/asin,v $
##
## Under source code control:	1994/03/19 01:40:24
## File existed as early as:	1994
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/