asin(3) — Linux manual page

asin(3)                 Library Functions Manual                 asin(3)

NAME

       asin, asinf, asinl - arc sine function

LIBRARY

       Math library (libm, -lm)

SYNOPSIS

       #include <math.h>

       double asin(double x);
       float asinf(float x);
       long double asinl(long double x);

   Feature Test Macro Requirements for glibc (see
   feature_test_macros(7)):

       asinf(), asinl():
           _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

       These functions calculate the principal value of the arc sine of
       x; that is the value whose sine is x.

RETURN VALUE

       On success, these functions return the principal value of the arc
       sine of x in radians; the return value is in the range
       [-pi/2, pi/2].

       If x is a NaN, a NaN is returned.

       If x is +0 (-0), +0 (-0) is returned.

       If x is outside the range [-1, 1], a domain error occurs, and a
       NaN is returned.

ERRORS

       See math_error(7) for information on how to determine whether an
       error has occurred when calling these functions.

       The following errors can occur:

       Domain error: x is outside the range [-1, 1]
              errno is set to EDOM.  An invalid floating-point exception
              (FE_INVALID) is raised.

ATTRIBUTES

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ asin(), asinf(), asinl()            │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       C99, POSIX.1-2001.

       The variant returning double also conforms to SVr4, 4.3BSD, C89.

SEE ALSO

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

COLOPHON

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Linux man-pages 6.9.1          2024-05-02                        asin(3)

Pages that refer to this page: acos(3), atan2(3), atan(3), cos(3), sin(3), tan(3)

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