# **ACOS()**

## **Function Description**

The ACOS() function returns the cosine (denoted in radians) of the given value.

## **Function Syntax**

```text
> ACOS(number)
```

## **Parameter definition**

| Parameters | Description |
| ---- | ---- |
| number | Required parameters, any numerical data type can be taken |

## **Example**

```text
drop table if exists t1;
create table t1(a float,b int);
insert into t1 values(0.5,1);
insert into t1 values(-0.5,-1);

mysql> select acs(a),acos(b) from t1;
+------------------------------------------------------------------------------------------------------------------------------
| acos(a) | acos(b) |
+------------------------------------------------------------------------------------------------------------------------------
| 1.0471975511965976 | 0 |
| 2.0943951023931957 | 3.141592653589793 |
+------------------------------------------------------------------------------------------------------------------------------
2 rows in set (0.01 sec)
```