What is Math.atan() in JavaScript?

In JavaScript, Math is a built-in object that contains different methods and properties used to perform mathematical operations. It contains an atan() function, which is used to compute a specified number’s arc tangent. This is also known as the inverse tangent of a number.

Syntax

Math.atan(param);

Parameter

  • param: This is a number that represents the tangent value. It is the input value of Number type for which we want to find the atan().

Number in JavaScript is a 64-bit double-precision value which is the same as double in C# or Java.

Return value

  • Number: It returns the angle θ whose tangent is equal to the given param. It is of Number type. Its range is:
      • π/2 <= θ <= π/2 (radians)

To convert radians to degrees, use the following formula.

  • Degrees = Radians × 180 / π

where π = 3.14159, approximately.

Example

console.log("atan(-1) = " + Math.atan(-1));
console.log("atan(0) = " + Math.atan(0));
console.log("atan(1) = " + Math.atan(1));
console.log("atan(∞) = " + Math.atan(Infinity));
console.log("atan(-∞) = " + Math.atan(-Infinity));