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    Command:

    coshf

    
    
    

    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():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The cosh() function returns  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.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  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.
    
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