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We show that the maximum impedance of the parallel combination of a resistor R, an inductor L and capacitor C, studied in a previous paper can be found analytically, without using calculus. In fact, we show that the maximum impedance of this parallel combination is just the value of the resistor R and occurs when the driving frequency  is equal to 1/ . o   LC These results were only demonstrated graphically in the aforementioned paper. We also provide PSpice simulations which verify the theoretical predictions.

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Latin American Journal of Physics Education