Is there any way to delete a dynamically allocated array in another function?

Question

I am learning pointers in C++. This is the exercise given by my teacher:

6. Duplicate a given array.
int* copyArray(int* arr, int n)

My function:

int* copyArray(int* arr, int n)
{
    int* copy = new int[n];

    for (int i = 0; i < n; ++i)
        copy[i] = arr[i];
    return copy; 

}

My main function:

int main()
{
    int a[] = { -2, -3, 4, -1, -2, 1, 5, -3 };
    int* copyPtr = new int[8];
    copyPtr = copyArray(a, 8);

    for (int i = 0; i < 8; ++i)
        cout << copyPtr[i] << " "; 
    delete[] copyPtr;
}

Is there any way that I can delete copy array from the main function? I understand the use of smart pointers but I cant use it in this case because of the prototype given by my teacher.