acos
Description
Syntax:
DOUBLE acos(DOUBLE x)
This function returns the arccosine of x. If x is beyond the range of [-1, 1], it will return nan .
Example
mysql> select acos(1);
+-----------+
| acos(1.0) |
+-----------+
| 0 |
+-----------+
mysql> select acos(0);
+--------------------+
| acos(0.0) |
+--------------------+
| 1.5707963267948966 |
+--------------------+
mysql> select acos(-2);
+------------+
| acos(-2.0) |
+------------+
| nan |
+------------+Keywords
ACOS