# Excel COS Function

Summary

The Excel COS function returns the cosine of an angle given in radians. To supply an angle to COS in degrees, multiply the angle by PI()/180 or use the RADIANS function to convert to radians.

Purpose

Get the cosine of an angle

Return value

The cosine value

Syntax

=COS (number)

Arguments

**number**- The angle in radians for which you want the cosine.

Usage notes

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