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RedHat 9 (Linux i386) - man page for acosh (redhat section 3)

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

NAME
       acosh - inverse hyperbolic cosine function

SYNOPSIS
       #include <math.h>

       double acosh(double x);

DESCRIPTION
       The  acosh()  function  calculates  the	inverse hyperbolic cosine of x; that is the value
       whose hyperbolic cosine is x.  If x is less than 1.0, acosh() returns  not-a-number  (NaN)
       and errno is set.

ERRORS
       EDOM   x is out of range.

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       asinh(3), atanh(3), cosh(3), sinh(3), tanh(3)

					    1993-06-13					 ACOSH(3)


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