ASIN

NAME

asin, asinf, asinl - arc sine function

SYNOPSIS

#include <math.h>

double asin(double x);

float asinf(float x);

long double asinl(long double x);

DESCRIPTION

The fBasin()fP function calculates the arc sine of fIxfP; that is the value whose sine is fIxfP. If fIxfP falls outside the range -1 to 1, fBasin()fP fails and fIerrnofP is set.

RETURN VALUE

The fBasin()fP function returns the arc sine in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).

ERRORS

EDOM: fIxfP is out of range.

CONFORMING TO

SVID 3, POSIX, BSD 4.3, ISO 9899. The float and long double variants are C99 requirements.