\frac{\mathrm d^2I(t)}{\mathrm dt^2}+2\gamma\frac{\mathrm dI(t)}{\mathrm dt}+{\omega_0}^2I(t)=0
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Recent Referers:
  1. http://www.edu.cc.uec.ac.jp/~k1710157/CL15/denkikairo.html