asinf(3) · carta

Usage

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

_ISOC99_SOURCE { | | _POSIX_C_SOURCE >= 200112L}

Math library (libm, -lm)

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

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.

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.

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
asin(), asinf(), asinl()	Thread safety	MT-Safe