2 tan - trigonometric tangent
9 eps nonzero real, defaults to epsilon()
14 Calculate the tangent of x to a multiple of eps, with error less
15 in absolute value than .75 * eps.
18 ; print tan(1, 1e-5), tan(1, 1e-10), tan(1, 1e-15), tan(1, 1e-20)
19 1.55741 1.5574077247 1.557407724654902 1.55740772465490223051
22 unlike sin and cos, x must be real
26 NUMBER *qtan(NUMBER *x, NUMBER *eps)
29 sin, cos, sec, csc, cot, epsilon
31 ## Copyright (C) 1999 Landon Curt Noll
33 ## Calc is open software; you can redistribute it and/or modify it under
34 ## the terms of the version 2.1 of the GNU Lesser General Public License
35 ## as published by the Free Software Foundation.
37 ## Calc is distributed in the hope that it will be useful, but WITHOUT
38 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
39 ## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
40 ## Public License for more details.
42 ## A copy of version 2.1 of the GNU Lesser General Public License is
43 ## distributed with calc under the filename COPYING-LGPL. You should have
44 ## received a copy with calc; if not, write to Free Software Foundation, Inc.
45 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
47 ## @(#) $Revision: 30.1 $
48 ## @(#) $Id: tan,v 30.1 2007/03/16 11:10:42 chongo Exp $
49 ## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/tan,v $
51 ## Under source code control: 1994/03/19 01:40:29
52 ## File existed as early as: 1994
54 ## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
55 ## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/