Document complex math library.

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+.\"	$OpenBSD: creal.3,v 1.1 2011/07/20 17:50:43 martynas Exp $
+.\"
+.\" Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate: July 20 2011 $
+.Dt CREAL 3
+.Os
+.Sh NAME
+.Nm creal ,
+.Nm crealf ,
+.Nm creall
+.Nd complex real functions
+.Sh SYNOPSIS
+.Fd #include <complex.h>
+.Ft double
+.Fn creal "double complex z"
+.Ft float
+.Fn crealf "float complex z"
+.Ft long double
+.Fn creall "long double complex z"
+.Sh DESCRIPTION
+The
+.Fn creal ,
+.Fn crealf
+and
+.Fn creall
+functions compute the real part of
+.Fa z .
+.Sh RETURN VALUES
+The
+.Fn creal ,
+.Fn crealf
+and
+.Fn creall
+functions return the real part of
+.Fa z .
+.Sh SEE ALSO
+.Xr carg 3
+.Sh STANDARDS
+The
+.Fn creal ,
+.Fn crealf
+and
+.Fn creall
+functions conform to
+.St -isoC-99 .