ACOS

Description

Returns the arc cosine of x, or NULL if x is not in the range -1 to 1.

Syntax

ACOS(<x>)

Parameters

Parameter	Description
<x>	The value for which the acos value is to be calculated

Return Value

The acos value of parameter x.

Example

select acos(1);

+-----------+
| acos(1.0) |
+-----------+
|         0 |
+-----------+

select acos(0);

+--------------------+
| acos(0.0)          |
+--------------------+
| 1.5707963267948966 |
+--------------------+

select acos(-2);

+------------+
| acos(-2.0) |
+------------+
|        nan |
+------------+