The asin() function of the Math object accepts a number and returns its arc sin value in radians. To convert the resultant value into degrees, multiply it with 180 and divide the result by 3.14159 (pi value).
Syntax
Its Syntax is as follows
Math.asin(0.5)
Example
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script type="text/javascript">
var result = Math.asin(0.5);
document.write("arcsine value: "+result);
document.write("<br>");
document.write("arcsine value in degrees: "+result*180/Math.PI);
</script>
</body>
</html>Output
arcsine value: 0.5235987755982989 arcsine value in degrees: 30.000000000000004