The Excel COS function returns the cosine of 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.
Get the cosine of an angle
The cosine value
number - The angle in radians for which you want the cosine.
The COS function expects radians. To supply an angle to COS in degrees, multiply the angle by PI()/180 or use the RADIANS function to convert to radians. For example, to get the COS of 60 degrees, you can use either formula below:
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