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57 lines
1.7 KiB
Plaintext
57 lines
1.7 KiB
Plaintext
NAME
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acos - inverse trigonometric cosine
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SYNOPSIS
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acos(x [,eps])
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TYPES
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x real, -1 <= x <= 1
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eps nonzero real, defaults to epsilon()
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return real
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DESCRIPTION
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Returns the acos of x to a multiple of eps with error less in
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absolute value than .75 * eps.
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v = acos(x) is the number in [0, pi] for which cos(v) = x.
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EXAMPLE
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; print acos(.5, 1e-5), acos(.5, 1e-10), acos(.5, 1e-15), acos(.5, 1e-20)
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1.0472 1.0471975512 1.047197551196598 1.04719755119659774615
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LIMITS
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none
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LINK LIBRARY
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NUMBER *qacos(NUMBER *x, NUMBER *eps)
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SEE ALSO
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asin, atan, asec, acsc, acot, epsilon
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## Copyright (C) 1999 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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##
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## @(#) $Revision: 29.3 $
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## @(#) $Id: acos,v 29.3 2006/05/07 07:25:46 chongo Exp $
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## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/acos,v $
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##
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## Under source code control: 1994/03/19 01:40:23
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## File existed as early as: 1994
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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