asin.3   [plain text]


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.\"     from: @(#)asin.3	5.1 (Berkeley) 5/2/91
.\"	$Id: asin.3,v 1.3 2003/08/17 20:36:46 scp Exp $
.\"
.Dd November 15, 2002
.Dt ASIN 3
.Os
.Sh NAME
.Nm asin 
.Nd arc sine function
.Sh SYNOPSIS
.Fd #include <math.h>
.Ft double
.Fn asin "double x"
.\\.Ft float
.\\.Fn asinf "float x"
.Sh DESCRIPTION
The
.Fn asin
.\\and
.\\.Fn asinf
function computes the principal value of the arc sine of
.Fa x 
in the range
.Bk -words
.Bq -\*(Pi/2, +\*(Pi/2 .
.Ek
.Sh SPECIAL VALUES
.Fn asin "0"
returns 0.
.Pp
.Fn asin "x"
returns a NAN and raises the "invalid" floating-point exception for |x| > 1.
.Sh SEE ALSO
.Xr acos 3 ,
.Xr atan 3 ,
.Xr atan2 3 ,
.Xr cos 3 ,
.Xr cosh 3 ,
.Xr sin 3 ,
.Xr sinh 3 ,
.Xr tan 3 ,
.Xr tanh 3 ,
.Xr math 3 ,
.Xr matherr 3
.Sh STANDARDS
The
.Fn asin
.\\and
.\\.Fn asinf
function conforms to ISO/IEC 9899:1999(E).