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2c4abcd2b7
Added the following new trigonometric functions:
cas(x [,eps]) trigonometric cosine plus sine
cis(x [,eps]) Euler's formula
89 lines
2.9 KiB
Plaintext
89 lines
2.9 KiB
Plaintext
NAME
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sec - trigonometric secant
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SYNOPSIS
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sec(x [,eps])
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TYPES
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x number (real or complex)
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eps 0 < real < 1, defaults to epsilon()
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return real
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DESCRIPTION
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Calculate the trigonometric secant of x to a multiple of eps, with error less
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in absolute value than .75 * eps.
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This function is equivalent to:
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sec(x) = 1 / cos(x)
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EXAMPLE
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; print sec(1/2), sec(5/7), sec(42/7)
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1.13949392732454912231 1.3235192673191814545 1.04148192659510767648
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; print sec(1, 1e-5), sec(1, 1e-10), sec(1, 1e-15), sec(1, 1e-20)
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1.85082 1.8508157177 1.850815717680926 1.85081571768092561791
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; print sec(2 + 3i, 1e-5), sec(2 + 3i, 1e-10)
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~-0.04167497639869547021+~0.09061109101765280898i ~-0.04167496441100888150+~0.09061113719571288336i
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; pi = pi(1e-20)
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; print sec(pi/6), sec(pi/2), sec(pi)
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1.15470053837925152902 756606132568153667453.84481533280934425956 -1
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; # NOTE: The huge value for sec(pi/2) is because the pi variable is not exactly pi.
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LIMITS
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0 < eps < 1
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LINK LIBRARY
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NUMBER *qsec(NUMBER *x, NUMBER *eps)
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COMPLEX *c_sec(COMPLEX *c, NUMBER *eps)
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SEE ALSO
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sin, cos, tan, cot, csc
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asin, acos, atan, acot, asec, acsc
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versin, coversin, vercos, covercos
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aversin, acoversin, avercos, acovercos
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haversin, hacoversin, havercos, hacovercos
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ahaversin, hacoversin, havercos, ahacovercos
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exsec, aexsec, excsc, aexcsc
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crd, acrd
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cas, cis
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epsilon
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EXTERNAL RESOURCES
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For general information on trigonometric functions, see:
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https://en.wikipedia.org/wiki/Trigonometric_functions#Unit-circle_definitions
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https://en.wikipedia.org/wiki/Versine
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https://en.wikipedia.org/wiki/Exsecant
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https://en.wikipedia.org/wiki/Inverse_trigonometric_functions
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https://en.wikipedia.org/wiki/Chord_(geometry)
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https://en.wikipedia.org/wiki/Secant_line
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https://en.wikipedia.org/wiki/Hartley_transform#cas
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https://en.wikipedia.org/wiki/Cis_(mathematics)
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## Copyright (C) 1999,2023 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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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1995/11/13 03:49:00
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## File existed as early as: 1995
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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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