ASIN

Section: Linux Programmer's Manual (3)
Updated: 2002-07-25
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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);

Link with -lm.

DESCRIPTION

The asin() function calculates the arc sine of x; that is the value whose sine is x. If x falls outside the range -1 to 1, asin() fails and errno is set.

RETURN VALUE

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

ERRORS

EDOM: x is out of range.

CONFORMING TO

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