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-.\" Copyright (c) 1985, 1991, 1993
-.\" The 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. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgement:
-.\" This product includes software developed by the University of
-.\" California, Berkeley and its contributors.
-.\" 4. 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.
-.\"
-.\" @(#)sqrt.3 8.1 (Berkeley) 6/4/93
-.\" $FreeBSD$
-.\"
-.Dd June 4, 1993
-.Dt SQRT 3
-.Os
-.Sh NAME
-.Nm cbrt ,
-.Nm sqrt
-.Nd cube root and square root functions
-.Sh LIBRARY
-.Lb libm
-.Sh SYNOPSIS
-.In math.h
-.Ft double
-.Fn cbrt "double x"
-.Ft double
-.Fn sqrt "double x"
-.Sh DESCRIPTION
-The
-.Fn cbrt
-function computes
-the cube root of
-.Ar x .
-.Pp
-The
-.Fn sqrt
-computes the
-non-negative square root of x.
-.Sh RETURN VALUES
-The
-.Fn cbrt
-function returns the requested cube root.
-The
-.Fn sqrt
-function returns the requested square root
-unless an error occurs.
-On the
-.Tn VAX
-or
-.Tn Tahoe
-processor an attempt to take the
-.Fn sqrt
-of negative
-.Fa x
-causes an error; in this event,
-the global variable
-.Va errno
-is set to
-.Er EDOM
-and a reserved operand fault is generated.
-.Sh ERROR (due to Roundoff etc.)
-The
-.Fn cbrt
-function
-is accurate to within 0.7
-.Em ulps .
-.Pp
-The
-.Fn sqrt
-function on a
-.Tn VAX
-is accurate to within 0.501
-.Em ulps .
-Sqrt on a machine that conforms to
-.Tn IEEE
-754 is correctly rounded
-in accordance with the rounding mode in force; the error is less than
-half an
-.Em ulp
-in the default mode (round\-to\-nearest).
-An
-.Em ulp
-is one
-.Em U Ns nit
-in the
-.Em L Ns ast
-.Em P Ns lace
-carried.
-.Sh SEE ALSO
-.Xr infnan 3 ,
-.Xr math 3
-.Sh STANDARDS
-The
-.Fn sqrt
-function conforms to
-.St -isoC .
-.Sh HISTORY
-The
-.Fn cbrt
-function appeared in
-.Bx 4.3 .