8 x number (real or complex)
9 eps nonzero real, defaults to epsilon()
14 Calculate the cosine of x to a multiple of eps with error less in
15 absolute value than .75 * eps.
18 ; print cos(1, 1e-5), cos(1, 1e-10), cos(1, 1e-15), cos(1, 1e-20)
19 .5403 .5403023059 .54030230586814 .5403023058681397174
21 ; print cos(2 + 3i, 1e-5), cos(2 + 3i, 1e-10)
22 -4.18963-9.10923i -4.189625691-9.1092278938i
25 ; print cos(pi/3, 1e-10), cos(pi/2, 1e-10), cos(pi, 1e-10)
32 NUMBER *qcos(NUMBER *x, NUMBER *eps)
33 COMPLEX *c_cos(COMPLEX *x, NUMBER *eps)
36 sin, tan, sec, csc, cot, epsilon
38 ## Copyright (C) 1999 Landon Curt Noll
40 ## Calc is open software; you can redistribute it and/or modify it under
41 ## the terms of the version 2.1 of the GNU Lesser General Public License
42 ## as published by the Free Software Foundation.
44 ## Calc is distributed in the hope that it will be useful, but WITHOUT
45 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
46 ## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
47 ## Public License for more details.
49 ## A copy of version 2.1 of the GNU Lesser General Public License is
50 ## distributed with calc under the filename COPYING-LGPL. You should have
51 ## received a copy with calc; if not, write to Free Software Foundation, Inc.
52 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
54 ## @(#) $Revision: 30.1 $
55 ## @(#) $Id: cos,v 30.1 2007/03/16 11:10:42 chongo Exp $
56 ## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/cos,v $
58 ## Under source code control: 1994/03/19 01:40:27
59 ## File existed as early as: 1994
61 ## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
62 ## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/