cosh

来自「Calc Software Package for Number Calc」· 代码 · 共 57 行

NAME
    cosh - hyperbolic cosine

SYNOPSIS
    cosh(x [,eps])

TYPES
    x		real
    eps		nonzero real, defaults to epsilon()

    return	real

DESCRIPTION
    Calculate the cosh of x to the nearest or next to nearest multiple of
    epsilon, with absolute error less than .75 * abs(eps).

    cosh(x) = (exp(x) + exp(-x))/2

EXAMPLE
    ; print cosh(1, 1e-5), cosh(1, 1e-10), cosh(1, 1e-15), cosh(1, 1e-20)
    1.54308 1.5430806348 1.543080634815244 1.54308063481524377848

LIMITS
    none

LINK LIBRARY
    NUMBER *qcosh(NUMBER *x, NUMBER *eps)

SEE ALSO
    sinh, tanh, sech, csch, coth, epsilon

## Copyright (C) 1999  Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
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## 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
##
## @(#) $Revision: 29.3 $
## @(#) $Id: cosh,v 29.3 2006/05/07 07:25:46 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/cosh,v $
##
## Under source code control:	1994/03/19 01:40:28
## File existed as early as:	1994
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## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/