Mysql Acos Function

MySQL: ACOS Function

This tutorial explains how to use the MySQL ACOS function with syntax and examples.


The MySQL ACOS function returns the arc cosine of a number.


The syntax for the ACOS function in MySQL is:

ACOS( number )

Parameters or Arguments


The number used to calculate the arc cosine.


  • The ACOS function will return NULL, if number is not within the range of -1 to 1.

Applies To

The ACOS function can be used in the following versions of MySQL:

  • MySQL 5.7, MySQL 5.6, MySQL 5.5, MySQL 5.1, MySQL 5.0, MySQL 4.1, MySQL 4.0, MySQL 3.23


Let's look at some MySQL ACOS function examples and explore how to use the ACOS function in MySQL.

For example:

mysql> SELECT ACOS(0.75);
Output: 0.7227342478134157

mysql> SELECT ACOS(0.2);
Output: 1.369438406004566

mysql> SELECT ACOS(-0.9);
Output: 2.6905658417935308

mysql> SELECT ACOS(2);
Output: NULL