Excel COS Function
This post will guide you how to use Excel COS function with syntax and examples in Microsoft excel.
Table of Contents
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 buildin 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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