1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
2 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
3 .\" <mtk.manpages@gmail.com>
5 .\" SPDX-License-Identifier: Linux-man-pages-copyleft
7 .\" References consulted:
8 .\" Linux libc source code
9 .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
11 .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
12 .\" Modified 2002-07-27 by Walter Harms
13 .\" (walter.harms@informatik.uni-oldenburg.de)
15 .TH ASINH 3 2021-03-22 "Linux man-pages (unreleased)"
17 asinh, asinhf, asinhl \- inverse hyperbolic sine function
20 .RI ( libm ", " \-lm )
25 .BI "double asinh(double " x );
26 .BI "float asinhf(float " x );
27 .BI "long double asinhl(long double " x );
31 Feature Test Macro Requirements for glibc (see
32 .BR feature_test_macros (7)):
37 _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
38 || _XOPEN_SOURCE >= 500
39 .\" || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
40 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
41 || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
47 _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
48 || /* Since glibc 2.19: */ _DEFAULT_SOURCE
49 || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
52 These functions calculate the inverse hyperbolic sine of
54 that is the value whose hyperbolic sine is
57 On success, these functions return the inverse hyperbolic sine of
62 is a NaN, a NaN is returned.
66 is +0 (\-0), +0 (\-0) is returned.
70 is positive infinity (negative infinity),
71 positive infinity (negative infinity) is returned.
73 .\" POSIX.1-2001 documents an optional range error for subnormal x;
74 .\" glibc 2.8 does not do this.
78 For an explanation of the terms used in this section, see
86 Interface Attribute Value
91 T} Thread safety MT-Safe
97 C99, POSIX.1-2001, POSIX.1-2008.