'\" t
.\" Copyright (c) 2026 Bruce Hill
.\" All rights reserved.
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.TH Num.asin 3 2026-08-27 "Tomo man-pages"
.SH NAME
Num.asin \- arc sine
.SH LIBRARY
Tomo Standard Library
.SH SYNOPSIS
.nf
.BI Num.asin\ :\ func(x:\ Num\ ->\ Num?)
.fi
.SH DESCRIPTION
The arc sine of a number, in radians.


.SH ARGUMENTS

.TS
allbox;
lb lb lbx
l l l.
Name	Type	Description
x	Num	The number whose arc sine is to be computed. 
.TE
.SH RETURN
The arc sine of `x`, or `none` if `x` is outside [-1, 1].

.SH EXAMPLES
.EX
assert (0.).asin()! == 0
assert (2.).asin() == none
.EE
.SH SEE ALSO
.BR Tomo-Num (3)