SQL Server/T-SQL/Transact SQL/ATAN

ATAN: Returns as a float data type, the angle in radians to the entered tangent

1> -- ATAN: Returns as a float data type, the angle in radians to the entered tangent.
2>
3> SELECT ATAN(0.87)
4> GO
------------------------
     0.71599111441630015
(1 rows affected)
1>