# Python atan2

The Python atan2 function returns the angle (in radius) from the X-Axis to the specified point (y, x). In this section, we discuss how to use atan2 function in Python Programming language with example.

The syntax of the atan2 Function in Python Programming Language is

`math.atan2(y, x);`
• X: It can be a number or a valid numerical expression which represent Cartesian X – Coordinate.
• Y: It can be a number or a valid numerical expression which represent Cartesian Y – Coordinate.

HINT: If we pass any non-numeric values to the atan2 Function, then atan2 function return TypeError as output

## Python atan2 Function Example

The atan2 Function in Python Language returns the angle (in radius) from the X -Axis to the specified point (y, x). In this atan2 example, We are going to find the same with different data types and display the output

TIP: Please refer to the Python tan Function article to understand the Python Tangent Function.

```# Python ATAN2 Function

import math

Tup = (1, 2, 3, -4 , 5)
Lis = [-1, 2, -3.5, -4 , 5]

print('Tangent value of Positive Number = %.2f' %math.atan2(2, 4))
print('Tangent value of Negative Number = %.2f' %math.atan2(-1, 6))

print('Tangent value of Tuple Item = %.2f' %math.atan2(Tup, Tup))
print('Tangent value of List Item = %.2f' %math.atan2(Lis, Lis))

print('Tangent value of Multiple Number = %.2f' %math.atan2(2 + 7 - 4, 9-5))

print('Tangent value of String Number = %.2f', math.atan2('Hello', 'Python'))
```

First, we used the atan2 Function directly on both the Positive integer and negative integer. The following statements find the angle (in radius) for the corresponding values.

```print('Tangent value of Positive Number = %.2f' %math.atan2(2, 4))
print('Tangent value of Negative Number = %.2f' %math.atan2(-1, 6))```

Next, we used the atan2 Function on Python Tuple and Python List items. If you see the above screenshot, the atan2 function is working perfectly on them.

```print('Tangent value of Tuple Item = %.2f' %math.atan2(Tup, Tup))
print('Tangent value of List Item = %.2f' %math.atan2(Lis, Lis))```

Next, we used the atan2 Math function on multiple values.

`print('Tangent value of Multiple Number = %.2f' %math.atan2(2 + 7 - 4, 9-5))`

Within the last statement, we tried atan2 Function on the string value, and it returns TypeError as output

`print('Tangent value of String Number = %.2f', math.atan2('Hello', 'Python'))`