asin(3) - Linux manual page (original) (raw)

asin(3) Library Functions Manual asin(3)

NAME top

   asin, asinf, asinl - arc sine function

LIBRARY top

   Math library (_libm_, _-lm_)

SYNOPSIS top

   **#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 top

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

RETURN VALUE top

   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 top

   See [math_error(7)](../man7/math%5Ferror.7.html) 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](../man3/errno.3.html)_ is set to **EDOM**.  An invalid floating-point exception
          (**FE_INVALID**) is raised.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **asin**(), **asinf**(), **asinl**()             │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   C11, POSIX.1-2008.

HISTORY top

   C99, POSIX.1-2001.

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

SEE ALSO top

   [acos(3)](../man3/acos.3.html), [atan(3)](../man3/atan.3.html), [atan2(3)](../man3/atan2.3.html), [casin(3)](../man3/casin.3.html), [cos(3)](../man3/cos.3.html), [sin(3)](../man3/sin.3.html), [tan(3)](../man3/tan.3.html)

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Linux man-pages 6.10 2024-07-23 asin(3)

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