COS Returns a float value that is the cosine of the angle passed in as a parameter. : COS « Math Functions « SQL Server / T-SQL Tutorial

1. SQL Server / T-SQL Tutorial
2. Math Functions
3. COS

Note that this angle passed in must be in radians.
7>
8> SELECT COS(1.2)
9> GO

------------------------
     0.36235775447667362

(1 rows affected)
1> SELECT COS(ACOS(0.5))
2> GO

------------------------
     0.49999999999999989

(1 rows affected)