How to use COS function in Excel

This article describes the formula syntax and usage of the COS function in Microsoft Excel.

Purpose

Returns the cosine of an angle provided in radians.

Sample Usage

COS(PI())

COS(A2)

COS(1)

Syntax

COS(angle)

  • angle – The angle to find the cosine of, in radians.

Example:

Result Formula
0.5403023059 =COS(1)
0.5403023059 =COS(-1)
-0.6536436209 =COS(4)
1 =COS(0)