1 files changed, 85 insertions, 0 deletions
diff --git a/lib/msun/man/atanh.3 b/lib/msun/man/atanh.3
new file mode 100644
index 000000000000..3fd9d2977d8f
--- /dev/null
+++ b/lib/msun/man/atanh.3
@@ -0,0 +1,85 @@
+.\" Copyright (c) 1985, 1991 Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd June 9, 2013
+.Dt ATANH 3
+.Os
+.Sh NAME
+.Nm atanh ,
+.Nm atanhf ,
+.Nm atanhl
+.Nd inverse hyperbolic tangent functions
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In math.h
+.Ft double
+.Fn atanh "double x"
+.Ft float
+.Fn atanhf "float x"
+.Ft long double
+.Fn atanhl "long double x"
+.Sh DESCRIPTION
+The
+.Fn atanh ,
+.Fn atanhf ,
+and
+.Fn atanhl
+functions compute the inverse hyperbolic tangent
+of the real
+argument
+.Fa x .
+For a discussion of error due to roundoff, see
+.Xr math 3 .
+.Sh RETURN VALUES
+These functions
+return the inverse hyperbolic tangent of
+.Fa x
+if successful.
+If the argument has absolute value 1, a divide-by-zero exception
+is raised and an infinity is returned.
+If
+.Fa |x|
+> 1, an invalid exception is raised and an \*(Na is returned.
+.Sh SEE ALSO
+.Xr acosh 3 ,
+.Xr asinh 3 ,
+.Xr exp 3 ,
+.Xr fenv 3 ,
+.Xr math 3
+.Sh HISTORY
+The
+.Fn atanh ,
+.Fn atanhf ,
+and
+.Fn atanhl
+functions appeared in
+.Bx 4.3 ,
+.Fx 2.0 ,
+and
+.Fx 10.0 ,
+respectively.