xref: /freebsd/lib/msun/man/asin.3 (revision 994297b01b98816bea1abf45ae4bac1bc69ee7a0)
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28.\"     from: @(#)asin.3	5.1 (Berkeley) 5/2/91
29.\" $FreeBSD$
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31.Dd July 31, 2008
32.Dt ASIN 3
33.Os
34.Sh NAME
35.Nm asin ,
36.Nm asinf ,
37.Nm asinl
38.Nd arc sine functions
39.Sh LIBRARY
40.Lb libm
41.Sh SYNOPSIS
42.In math.h
43.Ft double
44.Fn asin "double x"
45.Ft float
46.Fn asinf "float x"
47.Ft long double
48.Fn asinl "long double x"
49.Sh DESCRIPTION
50The
51.Fn asin ,
52.Fn asinf ,
53and
54.Fn asinl
55functions compute the principal value of the arc sine of
56.Fa x .
57.Sh RETURN VALUES
58These functions return the arc sine in the range
59.Bk -words
60.Bq -\*(Pi/2 , +\*(Pi/2
61.Ek
62radians.
63If:
64.Bd -unfilled -offset indent
65.Pf \&| Ns Fa x Ns \&| > 1
66.Ed
67.Pp
68.Fn asin x
69raises an invalid exception and returns an \*(Na.
70.Sh SEE ALSO
71.Xr acos 3 ,
72.Xr atan 3 ,
73.Xr atan2 3 ,
74.Xr cos 3 ,
75.Xr cosh 3 ,
76.Xr fenv 3 ,
77.Xr math 3 ,
78.Xr sin 3 ,
79.Xr sinh 3 ,
80.Xr tan 3 ,
81.Xr tanh 3
82.Sh STANDARDS
83The
84.Fn asin ,
85.Fn asinf ,
86and
87.Fn asinl
88functions conform to
89.St -isoC-99 .
90