Here is one way to write a Python function that calculates the area of a triangle given the angle and two sides:

```
import math

def triangle_area(angle, side1, side2):
    # Convert the angle to radians
    theta = math.radians(angle)
    
    # Use the sine and cosine functions to calculate the height
    height = side1 * math.sin(theta)
    base = side1 * math.cos(theta)
    if side2 > base:
        excess = side2 - base
        height += excess * math.tan(theta)
    
    # Calculate the area using the height and base
    area = 0.5 * base * height
    
    return area
```

This function uses the trigonometric functions sine, cosine, and tangent to calculate the height of the triangle. It then uses the formula for the area of a triangle, which is `0.5 * base * height`. The function handles the case where the given sides do not form a valid triangle by adding the excess length to the height. The function assumes that the given angle is the angle between the two sides.
Scrivi una funzione che calcoli l'area di un triangolo dati l'angolo e due lati.