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[math] E_n = \frac{m}{2}\left( \frac{d}{t_n} \right)^2 [/math]
[math] \delta E_n = -2\ E_n \frac{\delta t_n}{t_n} = -\frac{2 sqrt{2}}{\sqrt{m} d}\ E_n^{3/2} \delta t_n [/math]