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Language/Type: Python recursion return

Write a recursive function named sum_of_squares that accepts an integer parameter n and returns the sum of squares from 1 to n. For example, the call of sum_of_squares(3) should return 12 + 22 + 32 = 14. If your function is passed 0, return 0. If passed a negative number, your function should throw an int as an exception.

Constraints: Your function must be recursive. Do not use loops or data structures.

Function: Write a Python function as described, not a complete program.

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