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Excel COS Function

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 

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:

=COS(60*PI()/180)
=COS(RADIANS(60))
Related functions 
Excel SIN function
Excel SIN Function

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

Excel TAN function
Excel TAN Function

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

Good links 
Microsoft COS function documentation

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