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  12 .TH asin 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  13 .SH NAME
  14 asin, asinf, asinl \- arc sine function
  15 .SH SYNOPSIS
  16 .LP
  17 .nf
  18 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  19 #include <math.h>
  20 
  21 \fBdouble\fR \fBasin\fR(\fBdouble\fR \fIx\fR);
  22 .fi
  23 
  24 .LP
  25 .nf
  26 \fBfloat\fR \fBasinf\fR(\fBfloat\fR \fIx\fR);
  27 .fi
  28 
  29 .LP
  30 .nf
  31 \fBlong double\fR \fBasinl\fR(\fBlong double\fR \fIx\fR);
  32 .fi
  33 
  34 .SH DESCRIPTION
  35 .sp
  36 .LP
  37 These functions compute the principal value of the arc sine of their argument
  38 \fIx\fR. The value of \fIx\fR should be in the range [\(mi1,1].
  39 .SH RETURN VALUES
  40 .sp
  41 .LP
  42 Upon successful completion, these functions return the arc sine of \fIx\fR in
  43 the range [\(mi\c
  44 .if n pi\c
  45 .if t \(*p
  46 \c
  47 /2, \c
  48 .if n pi\c
  49 .if t \(*p
  50 \c
  51 /2] radians.
  52 .sp
  53 .LP
  54 For finite values of \fIx\fR not in the range [\(mi1,1], a domain error occurs
  55 and a NaN is returned.
  56 .sp
  57 .LP
  58 If \fIx\fR is NaN, NaN is returned.
  59 .sp
  60 .LP
  61 If \fIx\fR is \(+-0, \fIx\fR is returned.
  62 .sp
  63 .LP
  64 If \fIx\fR is \(+-Inf, a domain error occurs and a NaN is returned.
  65 .sp
  66 .LP
  67 For exceptional cases, \fBmatherr\fR(3M) tabulates the values to be returned by
  68 \fBasin()\fR as specified by SVID3 and XPG3.
  69 .SH ERRORS
  70 .sp
  71 .LP
  72 These functions will fail if:
  73 .sp
  74 .ne 2
  75 .mk
  76 .na
  77 \fBDomain Error\fR
  78 .ad
  79 .RS 16n
  80 .rt  
  81 The \fIx\fR argument is finite and not in the range [\(mi1,1], or is \(+-Inf.
  82 .sp
  83 If the integer expression (\fBmath_errhandling\fR & \fBMATH_ERREXCEPT\fR) is
  84 non-zero, the invalid floating-point exception is raised.
  85 .sp
  86 The \fBasin()\fR function sets \fBerrno\fR to \fBEDOM\fR if \fIx\fR is not
  87 \(+-Inf or NaN and is not in the range [\(mi1,1].
  88 .RE
  89 
  90 .SH USAGE
  91 .sp
  92 .LP
  93 An application wanting to check for exceptions should call
  94 \fBfeclearexcept\fR(\fBFE_ALL_EXCEPT\fR) before calling these functions. On
  95 return, if \fBfetestexcept\fR(\fBFE_INVALID\fR | \fBFE_DIVBYZERO\fR |
  96 \fBFE_OVERFLOW\fR | \fBFE_UNDERFLOW\fR) is non-zero, an exception has been
  97 raised. An application should either examine the return value or check the
  98 floating point exception flags to detect exceptions.
  99 .sp
 100 .LP
 101 An application can also set \fBerrno\fR to 0 before calling \fBasin()\fR. On
 102 return, if \fBerrno\fR is non-zero, an error has occurred. The \fBasinf()\fR
 103 and \fBasinl()\fR functions do not set \fBerrno\fR.
 104 .SH ATTRIBUTES
 105 .sp
 106 .LP
 107 See \fBattributes\fR(5) for descriptions of the following attributes:
 108 .sp
 109 
 110 .sp
 111 .TS
 112 tab() box;
 113 cw(2.75i) |cw(2.75i) 
 114 lw(2.75i) |lw(2.75i) 
 115 .
 116 ATTRIBUTE TYPEATTRIBUTE VALUE
 117 _
 118 Interface StabilityStandard
 119 _
 120 MT-LevelMT-Safe
 121 .TE
 122 
 123 .SH SEE ALSO
 124 .sp
 125 .LP
 126 \fBisnan\fR(3M), \fBfeclearexcept\fR(3M), \fBfetestexcept\fR(3M),
 127 \fBmath.h\fR(3HEAD), \fBmatherr\fR(3M), \fBsin\fR(3M), \fBattributes\fR(5),
 128 \fBstandards\fR(5)