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man:cosh

COSH(3) Linux Programmer's Manual COSH(3)

NAME

     cosh, coshf, coshl - hyperbolic cosine function

SYNOPSIS

     #include <math.h>
     double cosh(double x);
     float coshf(float x);
     long double coshl(long double x);
     Link with -lm.
 Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
     coshf(), coshl():
         _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
             || /* Since glibc 2.19: */ _DEFAULT_SOURCE
             || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

     These  functions  return  the  hyperbolic cosine of x, which is defined
     mathematically as:
         cosh(x) = (exp(x) + exp(-x)) / 2

RETURN VALUE

     On success, these functions return the hyperbolic cosine of x.
     If x is a NaN, a NaN is returned.
     If x is +0 or -0, 1 is returned.
     If x is positive infinity or negative infinity,  positive  infinity  is
     returned.
     If the result overflows, a range error occurs, and the functions return
     +HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, respectively.

ERRORS

     See math_error(7) for information on how to determine whether an  error
     has occurred when calling these functions.
     The following errors can occur:
     Range error: result overflow
            errno  is  set  to ERANGE.  An overflow floating-point exception
            (FE_OVERFLOW) is raised.

ATTRIBUTES

     For  an  explanation  of  the  terms  used   in   this   section,   see
     attributes(7).
     +-------------------------+---------------+---------+
     |Interface                | Attribute     | Value   |
     +-------------------------+---------------+---------+
     |cosh(), coshf(), coshl() | Thread safety | MT-Safe |
     +-------------------------+---------------+---------+

CONFORMING TO

     C99, POSIX.1-2001, POSIX.1-2008.
     The variant returning double also conforms to SVr4, 4.3BSD.

BUGS

     In  glibc  version  2.3.4  and  earlier,  an  overflow   floating-point
     (FE_OVERFLOW) exception is not raised when an overflow occurs.

SEE ALSO

     acosh(3), asinh(3), atanh(3), ccos(3), sinh(3), tanh(3)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                           COSH(3)
/data/webs/external/dokuwiki/data/pages/man/cosh.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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