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Manual Reference Pages  - ASIN (3)

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asin, asinf, asinl - arc sine function

CONTENTS

Synopsis
Description
Errors

#include <math.h> 



double asin(double x); 



float asinf(float x); 



long double asinl(long double x); 

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.

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

EDOM	x is out of range.

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

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

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