---
title: "cos"
description: "Returns the trigonometric cosine of number"
---

# cos

> Returns the trigonometric cosine of number

**This function is used by Ignition's Expression language.**
## Description
Returns the trigonometric cosine of number, which is interpreted as an angle expressed in radians. The results will be a floating point value.

## Syntax
`cos(number)`

### Parameters

| Type | Parameter | Description |
|---|---|---|
| Integer/Float | `number` | The number to get the cosine of. |

### Results
**Float** - The cosine of the number provided.

## Examples
```python title="Code Snippet"
cos(1.89) //returns -0.31381
```