# Excel COS Function

This post will guide you how to use** Excel COS function** with syntax and examples in Microsoft excel.

### Description

The Excel COS function returns the cosine of a given angle. If you want to supply an angle to COS function in degrees, then you need to multiply the angle by PI()/180. Or you can use the RADIANS function to the angle to radians.

The COS function is a build-in function in Microsoft Excel and it is categorized as a Math and Trigonometry Function.

The COS function is available in Excel 2016, Excel 2013, Excel 2010, Excel 2007, Excel 2003, Excel XP, Excel 2000, Excel 2011 for Mac.

### Syntax

The syntax of the COS function is as below:

= COS(number)

Where the COS function argument is:

**number –**This is a required argument. A number that used to be calculate the cosine of an angle.

**Note:**

- If your argument is in degrees, multiply it by PI()/180 or use the RADIANS function to convert it to radians.

### Excel COS Function Examples

The below examples will show you how to use Excel COS Function to return the cosine of an angle.

**1#** get the cosine of 1.25 radians, enter the following formula in Cell B1.

=COS(1.25)

**2#** get the cosine of 45 degrees, enter the following formula in Cell B2.

=COS(45*PI()/180)

**3#** get the cosine of 30 degrees, enter the following formula in Cell B3.

=COS(RADIANS(30))

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