Write the output of the following functions.
A function to add two numbers:

def add_numbers(a, b):
return a + b

result = add_numbers(5, 3)
print(result)
2. A function to check if a number is even:

def is_even(num):
if num % 2 == 0:
return True
else:
return False

print(is_even(4))
print(is_even(5))
3. A function to calculate the area of a circle:

import math

def area_of_circle(radius):
return math.pi * radius ** 2

print(area_of_circle(5))
4. A function to print a greeting message:

def greet(name):
print("Hello, " + name + "!")

greet("Alice")
greet("Bob")
5. A function to calculate the factorial of a number:
def factorial(num):
if num == 0:
return 1
else:
return num * factorial(num-1)

print(factorial(5))
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