# 2.11BSD#431 - /usr/man/cat3/acosh.0

    ASINH(3M)	    UNIX Programmer's Manual		ASINH(3M)

    NAME
         asinh, acosh, atanh - inverse hyperbolic functions

    SYNOPSIS
         #include <math.h>

         double asinh(x)
         double x;

         double acosh(x)
         double x;

         double atanh(x)
         double x;

    DESCRIPTION
         These functions compute the designated inverse hyperbolic
         functions for real arguments.

    ERROR (due to Roundoff etc.)
         These functions inherit much of their error from log1p
         described in exp(3M).  On a VAX, acosh is accurate to about
         3 ulps, asinh and atanh to about 2 ulps.  An ulp is one Unit
         in the Last Place carried.

    DIAGNOSTICS
         Acosh returns the reserved operand on a VAX if the argument
         is less than 1.

         Atanh returns the reserved operand on a VAX if the argument
         has absolute value bigger than or equal to 1.

    SEE ALSO
         math(3M), exp(3M), infnan(3M)

    AUTHOR
         W. Kahan, Kwok-Choi Ng

    Printed 11/26/99	  May 12, 1986				1

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