asin - Man Page

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).

InterfaceAttributeValue
asin(), asinf(), asinl()Thread safetyMT-Safe

Standards

C99, POSIX.1-2001, POSIX.1-2008.

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

See Also

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

Referenced By

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

The man pages asinf(3) and asinl(3) are aliases of asin(3).

2023-02-05 Linux man-pages 6.03