The atan() function of the Math object accepts a number and returns its arctangent 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.atan(0.5)
Example
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script type="text/javascript">
var result = Math.atan(0.5);
document.write("arctangent value: "+result);
document.write("<br>");
document.write("arctangent value in degrees: "+result*180/Math.PI);
</script>
</body>
</html>Output
arctangent value: 0.4636476090008061 arctangent value in degrees: 26.56505117707799