Cos help remark should say "RADIANS" rather than "COS".
 

The help for the COS worksheet function has a "Remark" section that reads as
follows:
If the angle is in degrees, multiply it by PI()/180 or use the COS function
to convert it to radians.

It should read:
If the angle is in degrees, multiply it by PI()/180 or use the RADIANS
function to convert it to radians.