# **COT()**

## **函数说明**

COT() 函数返回输入参数（用弧度表示）的余切值。

## **函数语法**

```text
> COT(number)
```

## **参数释义**

|  参数   | 说明  |
|  ----  | ----  |
| number | 必要参数，可取任意数值数据类型 |

## **示例**

```text
mysql> SELECT COT(12);
+---------------------+
| cot(12)             |
+---------------------+
| -1.5726734063976895 |
+---------------------+
1 row in set (0.00 sec)
```

```text
drop table if exists t1;
create table t1(a int,b float);
insert into t1 values(1,3.14159);
insert into t1 values(-1,12);

mysql> select cot(a), cot(b) from t1;
+---------------------+---------------------+
| cot(a)              | cot(b)              |
+---------------------+---------------------+
|  0.6420926159343306 |  -394449.0619219334 |
| -0.6420926159343308 | -1.5726734063976895 |
+---------------------+---------------------+
2 rows in set (0.01 sec)
```