atan

description

Syntax

DOUBLE atan(DOUBLE x) 返回x的反正切值，x为弧度值.

example

1. mysql> select atan(0);
2. +-----------+
3. | atan(0.0) |
4. +-----------+
5. |         0 |
6. +-----------+
7. mysql> select atan(2);
8. +--------------------+
9. | atan(2.0)          |
10. +--------------------+
11. | 1.1071487177940904 |
12. +--------------------+

keywords

1. ATAN