1ASINH(3M)                                                            ASINH(3M)
2
3
4

NAME

6       asinh, acosh, atanh - inverse hyperbolic functions
7

SYNOPSIS

9       #include <math.h>
10
11       double asinh(x)
12       double x;
13
14       double acosh(x)
15       double x;
16
17       double atanh(x)
18       double x;
19

DESCRIPTION

21       These functions compute the designated inverse hyperbolic functions for
22       real arguments.
23

ERROR (due to Roundoff etc.)

25       These functions inherit much of their error  from  log1p  described  in
26       exp(3M).   On a VAX, acosh is accurate to about 3 ulps, asinh and atanh
27       to about 2 ulps.  An ulp is one Unit in the Last Place carried.
28

DIAGNOSTICS

30       Acosh returns the reserved operand on a VAX if  the  argument  is  less
31       than 1.
32
33       Atanh  returns  the reserved operand on a VAX if the argument has abso‐
34       lute value bigger than or equal to 1.
35

SEE ALSO

37       math(3M), exp(3M), infnan(3M)
38

AUTHOR

40       W. Kahan, Kwok-Choi Ng
41
42
43
444.3 Berkeley Distribution        May 12, 1986                        ASINH(3M)