Find the interval of convergence of (-1)"(x - 9)" √n² +4 00 Σ n=0 (Use symbolic notation and fractions where needed. Give your answers as intervals in the form (*, *). Use the symbol ∞ for infinity, U for combining intervals, and an appropriate type of parenthesis " (", ") ", " [" or "]" depending on whether the interval is open or closed.) x E

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