---
title: "COS function"
slug: "cos-function"
updated: 2025-09-30T11:52:08Z
published: 2025-09-30T11:52:08Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.pigment.com/llms.txt
> Use this file to discover all available pages before exploring further.

# COS function

## Description

Returns the cosine of the given angle in radians.

## Syntax

`COS(Number)`

## Arguments

| **Argument** | **Type** | **Dimensions** | **Description** |
| --- | --- | --- | --- |
| *Number* (required) | Number | Any Dimensions | Angle in radians for which to compute the cosine. |

## Returns

| **Type** | **Dimensions** |
| --- | --- |
| Number | Dimensions of *Number* |

## Examples

| **Formula** | **Result** | **Description** |
| --- | --- | --- |
| `COS(0.524)` | 0.866 | The cosine of π/6 radians is 0.866. |
| `COS(0.785)` | 0.707 | The cosine of π/4 radians is 0.707. |
| `COS(1.571)` | 0 | The cosine of π/2 radians is 0. |
| `(1-COS(3.1416))/2` | 1 | The output of this formulation is the haversine. |

## 

## Related articles: [SIN function](/v1/docs/sin-function)