atan

description

Syntax

DOUBLE atan(DOUBLE x) 返回x的反正切值，x为弧度值.

example

mysql> select atan(0);
+-----------+
| atan(0.0) |
+-----------+
|         0 |
+-----------+
mysql> select atan(2);
+--------------------+
| atan(2.0)          |
+--------------------+
| 1.1071487177940904 |
+--------------------+

keywords

ATAN