ACOS

Syntax

ACOS(X)

Description

Returns the inverse cosine of X, which is the value whose cosine is X. If X is not in the range [-1,1], the function returns NULL.

Example

SELECT ACOS(-10), ACOS(0), ACOS(10), ACOS(-0.5), ACOS(0.5);
+-----------+--------------------+----------+--------------------+--------------------+
| ACOS(-10) | ACOS(0)            | ACOS(10) | ACOS(-0.5)         | ACOS(0.5)          |
+-----------+--------------------+----------+--------------------+--------------------+
|      NULL | 1.5707963267948966 |     NULL | 2.0943951023931957 | 1.0471975511965979 |
+-----------+--------------------+----------+--------------------+--------------------+
1 row in set (0.001 sec)