JavaScript Math - atan Method


Advertisements


Description

This method returns the arctangent in radians of a number. The atan method returns a numeric value between -pi/2 and pi/2 radians.

Syntax

Its syntax is as follows −

Math.atan( x ) ;

Parameter Details

x − A number.

Return Value

Returns the arctangent in radians of a number.

Example

Try the following example program.

<html>
   
   <head>
      <title>JavaScript Math atan() Method</title>
   </head>
   
   <body>
      
      <script type="text/javascript">
         var value = Math.atan(-1);
         document.write("First Test Value : " + value );
         
         var value = Math.atan(.5);
         document.write("<br />Second Test Value : " + value ); 
         
         value = Math.atan(30);
         document.write("<br />Third Test Value : " + value ); 
         
         var value = Math.atan("string");
         document.write("<br />Fourth Test Value : " + value ); 
      </script>
      
   </body>
</html>

Output

First Test Value : -0.7853981633974483
Second Test Value : 0.4636476090008061
Third Test Value : 1.5374753309166493
Fourth Test Value : NaN 

javascript_math_object.htm