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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 5.4		       January 14, 2005 		   FreeBSD 5.4

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