ACOSH(3)	       FreeBSD Library Functions Manual 	      ACOSH(3)

NAME
     acosh, acoshf -- inverse hyperbolic cosine functions

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     acosh(double x);

     float
     acoshf(float x);

DESCRIPTION
     The acosh() and the acoshf() functions compute the inverse hyperbolic
     cosine of the real argument x.  For a discussion of error due to round-
     off, see math(3).

RETURN VALUES
     The acosh() and the acoshf() functions return the inverse hyperbolic
     cosine of x.  If the argument is less than 1, acosh() raises an invalid
     exception and returns an NaN.

SEE ALSO
     asinh(3), atanh(3), exp(3), fenv(3), math(3)

HISTORY
     The acosh() function appeared in 4.3BSD.

FreeBSD 7.2		       January 14, 2005 		   FreeBSD 7.2

NAME - LIBRARY - SYNOPSIS - DESCRIPTION - RETURN VALUES - SEE ALSO - 
HISTORY -