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    Command:

    acoshf

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double acosh(double x);
           float acoshf(float x);
           long double acoshl(long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           acosh():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
               _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
               _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
           acoshf(), acoshl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The acosh() function calculates the inverse  hyperbolic  cosine  of  x;
           that is the value whose hyperbolic cosine is x.
    
    
    

    RETURN VALUE

           On  success, these functions return the inverse hyperbolic cosine of x.
    
           If x is a NaN, a NaN is returned.
    
           If x is +1, +0 is returned.
    
           If x is positive infinity, positive infinity is returned.
    
           If x is less than 1, a domain error occurs, and the functions return  a
           NaN.
    
    
    

    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:
    
           Domain error: x is less than 1
                  errno is set  to  EDOM.   An  invalid  floating-point  exception
                  (FE_INVALID) is raised.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
           4.3BSD, C89.
    
    
    

    SEE ALSO

    
    
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