The `Math.cos()`

function in JavaScript returns the cosine of a number. The cosine of a number is defined as the ratio of the adjacent side to the hypotenuse of a right-angled triangle.

Here’s an example of how to use the `Math.cos()`

function:

```
let angle = Math.PI / 4;
let cos = Math.cos(angle);
console.log(cos);
```

This will output `0.7071067811865475`

, which is the cosine of `Math.PI / 4`

. The value of `Math.PI`

is a constant in JavaScript that represents the mathematical constant pi.

Note that the `Math.cos()`

function takes an angle in radians as its argument. To convert an angle from degrees to radians, you can use the following formula:

`let radians = degrees * (Math.PI / 180);`

So, for example, to find the cosine of an angle of `30`

degrees, you can do the following:

```
let degrees = 30;
let radians = degrees * (Math.PI / 180);
let cos = Math.cos(radians);
console.log(cos);
```

This will output `0.8660254037844386`

, which is the cosine of `30`

degrees in radians.

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