# MS Excel: ACOS Function (WS)

This Excel tutorial explains how to use the Excel ACOS function with syntax and examples.

## Description

The Microsoft Excel ACOS function returns the arccosine (in radians) of a number.

## Syntax

The syntax for the Microsoft Excel ACOS function is:

`ACOS( number )`

### Parameters or Arguments

number is a number between -1 and 1. It is the cosine of the angle that you wish to find.

## Applies To

The ACOS function can be used in the following versions of Microsoft Excel:

• Excel 2013, Excel 2011 for Mac, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000

## Type of Excel Function

The ACOS function can be used in Microsoft Excel as the following type of function:

• Worksheet function (WS)

## Example (as Worksheet Function)

Let's look at some Excel ACOS function examples and explore how to use the ACOS function as a worksheet function in Microsoft Excel: Based on the spreadsheet above, the following Excel ACOS examples would return:

```=ACOS(A1)
Result: 2.498091545

=ACOS(A2)
Result: 1.570796327

=ACOS(A3)
Result: 0.722734248

=ACOS(0.2)
Result: 1.369438406```

Source: www.tutorialspoint.com

Advertisements