JavaScript Math atan() Method

The Javascript Math.atan( ) method is used to return the arctangent of a number in radians. The Math.atan() method returns a numeric value between -pi/2 and pi/2 radians. The atan() is a static method of Math, therefore, it is always used as Math.atan(), rather than as a method of a Math object created.

Math.atan(x)=arctan(x)=unique y where y belongs to [-pi/2;pi/2] such that tan(y)=x

Syntax:

Math.atan(value)

Parameters: This function accepts a single parameter as mentioned above and described below:

• x: which is a number in radians whose arctangent you want to find.

Returns: The Math.atan() function returns the arctangent of the given number in radians. The below examples illustrate the Math atan( ) method in JavaScript

Below is an example of the Math atan( ) Method.

Example 1: This example returns the atan value when 1 is passed as a parameter.

javascript

<script type="text/javascript">
    console.log("When 1 is passed as a parameter: "
    + Math.atan(1));
</script>

Output:

When 1 is  passed as a parameter: 0.7853981633974483

Example 2: This example returns the atan value when 0 is passed as a parameter.

javascript

<script type="text/javascript">
    console.log("When 0 is passed as a parameter: "
                + Math.atan(0));
</script>

Output:

When 0 is  passed as a parameter: 0

Example 3: This example returns the atan value when -0 is passed as a parameter.

javascript

<script type="text/javascript">
    console.log("When -0 is passed as a parameter: "
                + Math.atan(-0));
</script>

Output:

When -0 is  passed as a parameter: 0

Example 4: This example returns the atan value when infinity is passed as a parameter.

javascript

<script type="text/javascript">
        console.log("When Infinity is passed as a parameter: "
                    + Math.atan(Infinity));
</script>

Output:

When Infinity is  passed as a parameter: 1.5707963267948966

Example 5: This example returns the atan value when -infinity is passed as a parameter.

javascript

<script type="text/javascript">
        console.log("When -Infinity is passed as a parameter: "
                    + Math.atan(-Infinity));
</script>

Output:

When -Infinity is  passed as a parameter: -1.5707963267948966

We have a complete list of Javascript Math Objects methods, to check those please go through this Javascript Math Object Complete reference article.

Supported Browsers:

• Google Chrome 1 and above
• Internet Explorer 3 and above
• Firefox 1 and above
• Opera 3 and above
• Safari 1 and above