.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
+.\" %%%LICENSE_START(VERBATIM)
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
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.\"
.\" References consulted:
.\" Linux libc source code
The
.BR acosh ()
function calculates the inverse hyperbolic cosine of
-\fIx\fP; that is the value whose hyperbolic cosine is \fIx\fP.
-.SH "RETURN VALUE"
+.IR x ;
+that is the value whose hyperbolic cosine is
+.IR x .
+.SH RETURN VALUE
On success, these functions return the inverse hyperbolic cosine of
.IR x .
An invalid floating-point exception
.RB ( FE_INVALID )
is raised.
-.SH "CONFORMING TO"
+.SH CONFORMING TO
C99, POSIX.1-2001.
The variant returning
.I double
also conforms to
SVr4, 4.3BSD, C89.
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR asinh (3),
.BR atanh (3),
.BR cacosh (3),
.BR cosh (3),
.BR sinh (3),
.BR tanh (3)
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.