cosh, coshf, coshl - hyperbolic cosine function

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ cosh(), coshf(), coshl()                                                    │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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

       These functions return the hyperbolic cosine of x, which is defined mathematically as:

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

       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.

       C99, POSIX.1-2001.

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

       Math library (libm, -lm)

       cosh, coshf, coshl - hyperbolic cosine function

       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.

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

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

       C11, POSIX.1-2008.

#include<math.h>doublecosh(doublex);floatcoshf(floatx);longdoublecoshl(longdoublex);

   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