## What is COS function in Excel?

The **COS **function is one of the math functions of Excel.

It returns the **cosine **of an angle.

We can find this **function **in the **Math&trig** category of insert function Tab.

## How to use **COS **function in excel

- Click on an
**empty**cell (like F5 )

2. Click on the **fx **icon (or press** shift+F3**)

3. In the **insert function tab **you will see all functions

4. Select **math and trig** category

5. Select **COS **function

6. Then select **ok**

7. In the function arguments Tab you will see **COS **function

8. In the Number section you can enter the **angle in radians** for which you want the cosine

9. You will see results in formula result at the end of **function arguments** Tab

### Examples of **COS** function in excel

**Example 1:**

**How to use COS function in excel**

You can see examples of COS function below:

**cos**(A2) ----->>>>answer is -1
**cos**(A3) ----->>>>answer is 0.707
**cos**(A4) ----->>>>answer is -1
**cos**(A5) ----->>>>answer is 0
**cos**(A6) ----->>>>answer is 1

## What is the purpose of **COS** function?

**COS**

It returns the **cosine **of an angle.

## What is the Return value of **COS** function?

**COS**

It returns a number.

## How many arguments does **COS** function have?

**COS**This function has just **1** Argument.

The **argument **of COS function is **number**.

In the Number section you can enter the **angle in radians** for which you want the cosine

The argument of COS function is **required **and not optional.

```
COS(number) = number
```

## Which version of excel supports **COS** function?

**COS**This function is available for all excel **versions **(2003-2019)

## Errors in **COS** function

**COS**