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One method to ensure that the input types declared for a function are checked is to use conditional statements to check the type of the input argument. For example:

def add_numbers(num1, num2):
    if type(num1) == int and type(num2) == int:
        return num1 + num2
    else:
        raise TypeError("Both inputs must be integers")

In this example, the function checks if both inputs are integers using the type() function and raises a TypeError if either input is not an integer. This ensures that the input types declared for the function are checked without using the check-type function.