cosh(3) — Linux manual page

cosh(3)                 Library Functions Manual                 cosh(3)

NAME

       cosh, coshf, coshl - hyperbolic cosine function

LIBRARY

       Math library (libm, -lm)

SYNOPSIS

       #include <math.h>

       double cosh(double x);
       float coshf(float x);
       long double coshl(long double x);

   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 <= 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 │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       C99, POSIX.1-2001.

       The variant returning double also conforms to SVr4, 4.3BSD.

BUGS

       In glibc 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

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Linux man-pages 6.9.1          2024-05-02                        cosh(3)

Pages that refer to this page: acosh(3), asinh(3), atanh(3), sinh(3), tanh(3)

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