JavaScript Math.cos()
Syntax & Examples

Math.cos() static-method

The Math.cos() method in JavaScript returns the cosine of a number (x) given in radians. It is a static method of Math, meaning it is always used as Math.cos() and not as a method of a Math object created (Math is not a constructor).

Syntax of Math.cos()

The syntax of Math.cos() static-method is:

Math.cos(x)

This cos() static-method of Math returns the cosine of x.

Parameters

ParameterOptional/RequiredDescription
xrequiredA number representing an angle in radians for which to return the cosine.

Return Type

Math.cos() returns value of type Number.


✐ Examples

1 Using Math.cos() with a positive number

In this example, we use the Math.cos() method to find the cosine of 0 (radians).

For example,

  1. We call Math.cos() with 0 as the argument.
  2. The method returns the cosine of 0.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.cos(0));

Output

1

2 Using Math.cos() with Pi

In this example, we use the Math.cos() method to find the cosine of Pi radians.

For example,

  1. We call Math.cos() with Math.PI as the argument.
  2. The method returns the cosine of Pi.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.cos(Math.PI));

Output

-1

3 Using Math.cos() with a negative number

In this example, we use the Math.cos() method to find the cosine of -1 (radians).

For example,

  1. We call Math.cos() with -1 as the argument.
  2. The method returns the cosine of -1.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.cos(-1));

Output

0.5403023058681398

Summary

In this JavaScript tutorial, we learned about cos() static-method of Math: the syntax and few working examples with output and detailed explanation for each example.