1ASIN(3)                    Linux Programmer's Manual                   ASIN(3)
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NAME

6       asin, asinf, asinl - arc sine function
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SYNOPSIS

9       #include <math.h>
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11       double asin(double x);
12       float asinf(float x);
13       long double asinl(long double x);
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15       Link with -lm.
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17   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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19       asinf(), asinl():
20           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
21               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
22               || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
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DESCRIPTION

25       These  functions  calculate  the  principal value of the arc sine of x;
26       that is the value whose sine is x.
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RETURN VALUE

29       On success, these functions return the principal value of the arc  sine
30       of x in radians; the return value is in the range [-pi/2, pi/2].
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32       If x is a NaN, a NaN is returned.
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34       If x is +0 (-0), +0 (-0) is returned.
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36       If  x is outside the range [-1, 1], a domain error occurs, and a NaN is
37       returned.
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ERRORS

40       See math_error(7) for information on how to determine whether an  error
41       has occurred when calling these functions.
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43       The following errors can occur:
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45       Domain error: x is outside the range [-1, 1]
46              errno  is  set  to  EDOM.   An  invalid floating-point exception
47              (FE_INVALID) is raised.
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ATTRIBUTES

50       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
51       tributes(7).
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53       ┌─────────────────────────┬───────────────┬─────────┐
54       │Interface                │ Attribute     │ Value   │
55       ├─────────────────────────┼───────────────┼─────────┤
56       │asin(), asinf(), asinl() │ Thread safety │ MT-Safe │
57       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

59       C99, POSIX.1-2001, POSIX.1-2008.
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61       The variant returning double also conforms to SVr4, 4.3BSD, C89.
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SEE ALSO

64       acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3)
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COLOPHON

67       This  page  is  part of release 5.10 of the Linux man-pages project.  A
68       description of the project, information about reporting bugs,  and  the
69       latest     version     of     this    page,    can    be    found    at
70       https://www.kernel.org/doc/man-pages/.
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74                                  2017-09-15                           ASIN(3)
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