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89 lines
3.0 KiB
Plaintext
89 lines
3.0 KiB
Plaintext
NAME
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exsec - exterior trigonometric secant
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SYNOPSIS
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exsec(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 exterior 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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exsec(x) = sec(x) - 1
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EXAMPLE
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; print exsec(1/2), exsec(5/7), exsec(42/7)
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0.13949392732454912231 0.3235192673191814545 0.04148192659510767648
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; print exsec(1, 1e-5), exsec(1, 1e-10), exsec(1, 1e-15), exsec(1, 1e-20)
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0.85082 0.8508157177 0.850815717680926 0.85081571768092561791
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; print exsec(2 + 3i, 1e-5), exsec(2 + 3i, 1e-10)
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~-1.04167497639869547021+~0.09061109101765280898i ~-1.04167496441100888150+~0.09061113719571288336i
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; pi = pi(1e-20)
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; print exsec(pi/6), exsec(pi/2), exsec(pi)
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0.15470053837925152902 756606132568153667452.84481533280934425956 -2
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; # NOTE: The huge value for exsec(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 *qexsec(NUMBER *x, NUMBER *eps)
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COMPLEX *c_exsec(COMPLEX *c, NUMBER *eps)
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SEE ALSO
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sin, cos, tan, cot, sec, 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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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) 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: 2023/10/01 00:19:00
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## File existed as early as: 2023
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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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