mysql>mysql> SELECT ATAN(2);+-----------------+| ATAN(2) |+-----------------+| 1.1071487177941 |+-----------------+1 row in set (0.02 sec)mysql> SELECT ATAN(-2);+------------------+| ATAN(-2) |+------------------+| -1.1071487177941 |+------------------+1 row in set (0.00 sec)mysql>
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