This post will guide you how to use Google Sheets **ACOS **function with syntax and examples.

Table of Contents

**Description**

The Google Sheets ACOS function returns the arccosine value of a number.

The ACOS function can be used to get the inverse cosine of a number in google sheets. The purpose of this function is to get the inverse cosine of a given value and its returned value is angle in radians.

The ACOS function is a build-in function in Google Sheets and it is categorized as a MATH function**.**

**Syntax**

The syntax of the ACOS function is as below:

**= ACOS(number)**

**Where** the ACOS function argument is:

**Number –**This is a required argument. A number between -1 and 1 that you want the arccosine value.

## Google Sheets ACOS Function Examples

The below examples will show you how to use google sheets ACOS function to get the inverse cosine of a value.

**#1 =ACOS(B1)**

**Note:** the above formula will return the arccosine value of B1 cell.