man3/asin.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  23 .\" References consulted:
  24 .\"     Linux libc source code
  25 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  26 .\"     386BSD man pages
  27 .\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
  28 .\" Modified 2002-07-25 by Walter Harms
  29 .\"     (walter.harms@informatik.uni-oldenburg.de)
  30 .\"
  31 .TH ASIN 3 2002-07-25 "" "Linux Programmer's Manual"
  32 .SH NAME
  33 asin, asinf, asinl \- arc sine function
  34 .SH SYNOPSIS
  35 .nf
  36 .B #include <math.h>
  37 .sp
  38 .BI "double asin(double " x );
  39 .br
  40 .BI "float asinf(float " x );
  41 .br
  42 .BI "long double asinl(long double " x );
  43 .fi
  44 .sp
  45 Link with \-lm.
  46 .SH DESCRIPTION
  47 The \fBasin()\fP function calculates the arc sine of \fIx\fP; that is
  48 the value whose sine is \fIx\fP.  If \fIx\fP falls outside the range
  49 \-1 to 1, \fBasin()\fP fails and \fIerrno\fP is set.
  50 .SH "RETURN VALUE"
  51 The \fBasin()\fP function returns the arc sine in radians and the
  52 value is mathematically defined to be between -PI/2 and PI/2
  53 (inclusive).
  54 .SH ERRORS
  55 .TP
  56 .B EDOM
  57 \fIx\fP is out of range.
  58 .SH "CONFORMING TO"
  59 SVID 3, POSIX, BSD 4.3, ISO 9899.
  60 The float and long double variants are C99 requirements.
  61 .SH "SEE ALSO"
  62 .BR acos (3),
  63 .BR atan (3),
  64 .BR atan2 (3),
  65 .BR cos (3),
  66 .BR sin (3),
  67 .BR tan (3)