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# What is Math.cos() in JavaScript? Arslan Bajwa

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In JavaScript, Math is a built-in object that contains different methods and properties used to perform mathematical operations. It contains a cos() function, which is used to compute the cosine of a specified angle.

## Syntax

Math.cos(param);

## Parameter

• param: This is the angle for which we want to compute the cosine. Its type is Number, and it is measured in radians.

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 cosine of the given angle stored in param. It is of the Number type. Its range is:

• -1 <= result <= 1
• NaN: The function returns NaN if param is positive or negative Infinity.

Use the following formula to convert degrees to radians:

• Radians = Degrees x π /180

where π = 3.14159, approximately.

## Example

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

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CONTRIBUTOR Arslan Bajwa

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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