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JavaScript ATAN

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The JavaScript ATan function is one of the JavaScript Math function which is used to calculate the trigonometry Arc Tangent for the specified expression. Arc Tangent is also called as inverse of a Tangent, Please refer JavaScript TAN Function article to understand the Tangent Function. In this article we will show you, How to use ATAN() function in JavaScript Programming language with example.

Syntax of a JavaScript ATan Function

The basic syntax of the ATAN Function in JavaScript Programming language is as shown below:

Math.atan(number);

Number: It can be a number or a valid numerical expression for which you want to find Arc Tangent value.

  • If the number argument is positive or negative number, atan() function will return the Arc Tangent value.
  • If the number argument is not a number, atan() function will return NaN.

JavaScript ATan Function Example

The JavaScript ATan Function allows you to find the trigonometry Arc Tangent for the numeric values. In this example, We are going to find the Arc Tangent values of different data types and display the output

JAVASCRIPT CODE

<!DOCTYPE html>
<html>
<head>
    <title> JavaScript ATAN Function </title>
</head>
<body>
  <h1> JavaScript ATAN Function </h1>
  <p id = "Pos"></p>
  <p id = "Neg"></p>
  <p id = "Dec"></p>
  <p id = "Neg_Dec"></p>
  <p id = "Str"></p>
  <p id = "Exp"></p>
  <p id = "Null"></p>
  <p id = "Multi"></p>
 <script>
    document.getElementById("Pos").innerHTML = Math.atan(1);
    document.getElementById("Neg").innerHTML = Math.atan(-1);
    document.getElementById("Dec").innerHTML = Math.atan(0.45);
    document.getElementById("Neg_Dec").innerHTML = Math.atan(-0.75);
    document.getElementById("Str").innerHTML = Math.atan("JavaScript");
    document.getElementById("Null").innerHTML = Math.atan(null);
    document.getElementById("Multi").innerHTML = Math.atan(25 + 55 - 77);
  </script>
</body>
</html>

OUTPUT

JavaScript ATAN Function

ANALYSIS

First, We used the ATAN() Function directly on both the Positive integer and negative integer.

 document.getElementById("Pos").innerHTML = Math.atan(1);
 document.getElementById("Neg").innerHTML = Math.atan(-1);

Next, We used the ATAN() Function on both the Positive and negative Decimal values. If you observe the above screenshot, ATAN() function will work perfectly with decimal values as well

  document.getElementById("Dec").innerHTML = Math.atan(0.45);
  document.getElementById("Neg_Dec").innerHTML = Math.atan(-0.75);

Next, We tried ATAN() Function on String value. As we said before, this will return NaN (Not a Number) as output

document.getElementById("Str").innerHTML = Math.atan("JavaScript");

Next, We tried ATAN() Function on Null value and it return Zero as output

document.getElementById("Null").innerHTML = Math.atan(null);

In the below statement, We used the ATAN() Function directly on multiple values.

document.getElementById("Multi").innerHTML = Math.atan(25 + 55 - 77);

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