It is recommended to learn how to use Microsoft Office. In the case of Excel, some of its functions allow obtaining results that are tremendously useful in the field of mathematics. In this sense, it is recommended that you read this article with which you will learn **how to use the Excel functions ACOS and ACOSH step by step**

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## What is the ACOS function?

ACOS is a Microsoft Office Excel function used to **obtain the inverse cosine** or arc cosine of a number. In trigonometry, the inverse sine is an angle whose cosine is a number in radians that can range from zero to pi (π).

### What is the ACOSH function?

ACOSH refers to a Microsoft Office Excel function that allows **obtaining the inverse hyperbolic cosine** of a number. Therefore, it is a trigonometric and mathematical function. In order to obtain the inverse hyperbolic cosine, the number must be greater than one.

## How to use the Excel ACOS and ACOSH functions step by step

To use the ACOS and ACOSH Excel functions, you must **know the syntax** that makes up each of them, the arguments they require, and how to obtain a result. Next, we explain these aspects in detail so that you can fully understand the usefulness of these tools. You can even download and install LibreOffice if you prefer this tool.

### The ACOS function syntax

The ACOS function has a simple syntax: ACOS (number). Obviously, you only need a number as an argument. This number is mandatory and can return an arc cosine angle with a value between -1 and 1.

It is important to note that although the result is obtained in radians, it is possible to convert it to degrees after multiplying it by 180 and dividing it by PI (). Also, **the DEGREES function** can be **used** which will be just as effective as the previous procedure.

### The ACOSH function syntax

The ACOSH function also has a simple syntax: ACOSH (number). **The argument you need** or “number” must be a real value equal to or greater than 1 in order to return the hyperbolic cosine of that number.

### How to use the ACOS function in Excel

To use the ACOS function in Excel you can **enter a number in a cell** or a set of numbers if you prefer to do the calculation to obtain several angles. Then, click on the cell where you want to get the result and write = ACOS () inside the parentheses you must include the cell that contains the number.

For example, if you entered the number in cell A2, then the formula will be: = ACOS (A2). Press the “Enter” key and you will immediately see the result which is generally expressed in decimal values.

### How to use the ACOSH function in Excel

To use the ACOSH function in Excel you must **write the number or series of numbers** from which the inverse hyperbolic cosine will be obtained. Then, put the cursor in the cell where the result will be displayed and there, type = ACOSH (). You must place between the parentheses the value that corresponds to the cell that includes the number.

For example, if you have entered the number in cell A3, then the formula should be: = ACOSH (A3) press the “Enter” key to get the result. It is important to mention that the number you enter in the formula must be equal to or greater than 1 and the result will generally be a decimal value.

### Use the formula bar

Another way to use the ACOS and ACOSH functions in Excel is to **access the formula bar** (fx). This is at the top of the spreadsheet and allows us to select the necessary arguments to obtain a result from adding cells from different sheets to the use of financial functions.

To use the formula bar, click on “fx” and a new window titled “Insert Function” will immediately open. In “select a category” **click on “trigonometric”** . Then, find the ACOS or ACOSH function and press “OK.” In the new window, press the icon to the right of the text box and click on the cell that contains the number or series of numbers.