1ASINH(3M) ASINH(3M)
2
3
4
6 asinh, acosh, atanh - inverse hyperbolic functions
7
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
21 These functions compute the designated inverse hyperbolic functions for
22 real arguments.
23
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
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
37 math(3M), exp(3M), infnan(3M)
38
40 W. Kahan, Kwok-Choi Ng
41
42
43
444.3 Berkeley Distribution May 12, 1986 ASINH(3M)