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Sum of Divisors Equivalence

Write a function `are_equivalent(num1, num2)` that determines if the sum of the divisors (excluding the number itself) of two integers are the same.

#### Example Usage
```python [main.nopy]
are_equivalent(36, 57)  # Returns: False
are_equivalent(2, 4)    # Returns: False
are_equivalent(23, 47)  # Returns: True
```
import math

def div_sum(n):
    """
    Calculate the sum of all divisors of a number excluding the number itself.
    """
    # Placeholder for divisor sum logic
    pass

def are_equivalent(num1, num2):
    """
    Determine if the sum of divisors of two numbers are equivalent.
    """
    # Placeholder for equivalence logic
    pass