COS Function in Excel: Syntax, Examples and Free Practice
COS is an Excel Math & Trig function. Returns the cosine of an angle given in radians.
COS syntax
=COS(number)
Arguments
number: A number to use in the calculation
When to use COS
COS is used in financial models and engineering-style calculations where precise numeric work is needed.
Practice COS online, free
Open the live Excel-style spreadsheet and try COS yourself. No Excel install or sign-up needed to start.
Practice COS now →More Math & Trig functions
Frequently asked questions
What does the COS function do in Excel?
Returns the cosine of an angle given in radians.
What is the syntax of COS in Excel?
The syntax is =COS(number). number: A number to use in the calculation.
Where can I practice COS online for free?
Open the free live spreadsheet on Cellgrids and try COS yourself. No Excel install is needed and you can start without signing up.
All Excel formulas · Cheat sheet · Excel exercises · Math and Trig functions · Excel case studies · Excel tutorials · Excel shortcuts