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.\" Copyright (c) 2026 Bruce Hill
.\" All rights reserved.
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.TH Num.sqrt 3 2026-08-27 "Tomo man-pages"
.SH NAME
Num.sqrt \- square root
.SH LIBRARY
Tomo Standard Library
.SH SYNOPSIS
.nf
.BI Num.sqrt\ :\ func(x:\ Num\ ->\ Num?)
.fi
.SH DESCRIPTION
The square root of a number, exactly. The result of a non-square stays symbolic, so identities like `sqrt(2) * sqrt(2) == 2` hold.


.SH ARGUMENTS

.TS
allbox;
lb lb lbx
l l l.
Name	Type	Description
x	Num	The number whose square root is to be computed. 
.TE
.SH RETURN
The square root of `x`, or `none` if `x` is negative.

.SH EXAMPLES
.EX
assert (16.).sqrt()! == 4
assert (2.).sqrt()! * (2.).sqrt()! == 2
assert (-1.).sqrt() == none
.EE
.SH SEE ALSO
.BR Tomo-Num (3)