.\" Modified 2002-07-27 by Walter Harms
.\" (walter.harms@informatik.uni-oldenburg.de)
.\"
-.TH ASINH 3 2013-10-14 "GNU" "Linux Programmer's Manual"
+.TH ASINH 3 2017-09-15 "GNU" "Linux Programmer's Manual"
.SH NAME
asinh, asinhf, asinhl \- inverse hyperbolic sine function
.SH SYNOPSIS
.nf
.B #include <math.h>
-.sp
+.PP
.BI "double asinh(double " x );
-.br
.BI "float asinhf(float " x );
-.br
.BI "long double asinhl(long double " x );
.fi
-.sp
+.PP
Link with \fI\-lm\fP.
-.sp
+.PP
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
-.sp
+.PP
.ad l
.BR asinh ():
.RS 4
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
-_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L;
-.br
-or
-.I cc\ -std=c99
+_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
+ || _XOPEN_SOURCE\ >=\ 500
+.\" || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
+ || /* Since glibc 2.19: */ _DEFAULT_SOURCE
+ || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.RE
-.br
+.PP
.BR asinhf (),
.BR asinhl ():
.RS 4
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
-_POSIX_C_SOURCE\ >=\ 200112L;
-.br
-or
-.I cc\ -std=c99
+_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
+ || /* Since glibc 2.19: */ _DEFAULT_SOURCE
+ || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.RE
.ad b
.SH DESCRIPTION
-The
-.BR asinh ()
-function calculates the inverse hyperbolic sine of
+These functions calculate the inverse hyperbolic sine of
.IR x ;
that is the value whose hyperbolic sine is
.IR x .
.SH RETURN VALUE
On success, these functions return the inverse hyperbolic sine of
.IR x .
-
+.PP
If
.I x
is a NaN, a NaN is returned.
-
+.PP
If
.I x
is +0 (\-0), +0 (\-0) is returned.
-
+.PP
If
.I x
is positive infinity (negative infinity),
T} Thread safety MT-Safe
.TE
.SH CONFORMING TO
-C99, POSIX.1-2001.
+C99, POSIX.1-2001, POSIX.1-2008.
+.PP
The variant returning
.I double
also conforms to
-SVr4, 4.3BSD, C89.
+SVr4, 4.3BSD.
.SH SEE ALSO
.BR acosh (3),
.BR atanh (3),