# Python 3 - Number cos() Method

## Description

The cos() method returns the cosine of x radians.

## Syntax

Following is the syntax for cos() method −

```cos(x)
```

Note − This function is not accessible directly, so we need to import math module and then we need to call this function using math static object.

## Parameters

x − This must be a numeric value.

## Return Value

This method returns a numeric value between -1 and 1, which represents the cosine of the angle.

## Example

The following example shows the usage of cos() method.

```#!/usr/bin/python3
import math

print ("cos(3) : ",  math.cos(3))
print ("cos(-3) : ",  math.cos(-3))
print ("cos(0) : ",  math.cos(0))
print ("cos(math.pi) : ",  math.cos(math.pi))
print ("cos(2*math.pi) : ",  math.cos(2*math.pi))
```

## Output

When we run the above program, it produces the following result −

```cos(3) :  -0.9899924966
cos(-3) :  -0.9899924966
cos(0) :  1.0
cos(math.pi) :  -1.0
cos(2*math.pi) :  1.0
```
python_numbers.htm