SqlFunctions.Atan Method (Nullable<Decimal>)
A mathematical function that returns the angle, in radians, whose tangent is the specified numerical value. This angle is called the arctangent.
Assembly: System.Data.Entity (in System.Data.Entity.dll)
You cannot call this function directly. This function can only appear within a LINQ to Entities query.
This function is translated to a corresponding function in the database. For information about the corresponding SQL Server function, see ATAN (Transact-SQL).
Available since 4.0