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avocadogirl

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T^2 = [(T1^2 + T2^2)/2] + [{(T1^2-T2^2)/2} * {(l1+l2)/(l1-l2)}] --where T^2 is the period of an equivalent ideal pendulum, squared, and, T1 and T2 are the respective periods of corresponding ends of this reversible pendulum, then, l1 and l2 are the lengths from the respective end of the pendulum to the center of gravity.