cos

Returns the cosine of the angle specified in radians.

cos(angle)

angle: is any approximate numeric (float, real, or double precision) column name, variable, or constant expression.

select cos(44)

 0.999843

cos, a mathematical function, returns the cosine of the specified angle, in radians.

ANSI SQL – Compliance level: Transact-SQL extension.

Any user can execute cos.