# SQLite COS function

The COS function in SQLite is a mathematical function that returns the cosine of a given angle in radians. The cosine of an angle is defined as the ratio of the adjacent side of a right-angled triangle to the hypotenuse. The COS function can be used in SQL queries to perform mathematical calculations on numerical data stored in a SQLite database.

## Syntax

The syntax for using the COS function in SQLite is as follows:

```COS(X)
```

Here, X is the angle in radians for which the cosine is to be calculated. The function returns a value between -1 and 1, where -1 represents a cosine of 180 degrees and 1 represents a cosine of 0 degrees.

### Example

For example, consider a table myTable in a SQLite database that contains a column angle with values in radians. To calculate the cosine of each angle, you can use the following SQL query:

```SELECT COS(angle) FROM myTable;
```

This will return a result set with the cosine value for each angle in the angle column.

It is important to note that the input angle for the COS function must be in radians, not degrees. To convert an angle from degrees to radians, you can use the RADIANS function in SQLite, which converts a value in degrees to radians.

In summary, the COS function in SQLite is a useful mathematical function for calculating the cosine of an angle in radians. It can be used in SQL queries to perform calculations on numerical data stored in a SQLite database.