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# Math.cos()

The **`Math.cos()`** function returns the cosine of a number in radians.

## Syntax

```js
Math.cos(x)
```

### Parameters

- `x`
  - : A number representing an angle in radians.

### Return value

The cosine of `x`, between -1 and 1, inclusive. If `x` is `Infinity`, `-Infinity`, or `NaN`, returns `NaN`.

## Description

Because `cos()` is a static method of `Math`, you always use it as `Math.cos()`, rather than as a method of a `Math` object you created (`Math` is not a constructor).
