# **COS()**

## **Function Description**

The COS() function returns the cosine value of the input parameter (denoted in radians).

## **Function Syntax**

```text
> COS(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 int,b float);
insert into t1 values(1,3.14159);
insert into t1 values(-1,1.57);

mysql> select cos(a),cos(b) from t1;
+------------------------------------------------------------------------------------------------------------------------------
| cos(a) | cos(b) |
+------------------------------------------------------------------------------------------------------------------------------
| 0.5403023058681398 | -0.999999999999967865 |
| 0.5403023058681398 | 0.000796274258662553 |
+------------------------------------------------------------------------------------------------------------------------------
2 rows in set (0.01 sec)
```