/*mysql> select ATAN(1, 2);+------------------+| ATAN(1, 2) |+------------------+| 0.46364760900081 |+------------------+1 row in set (0.00 sec)mysql> select ATAN2(1, 2);+------------------+| ATAN2(1, 2) |+------------------+| 0.46364760900081 |+------------------+1 row in set (0.00 sec)*/ select ATAN(1, 2);select ATAN2(1, 2);
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