The model \eqref{theta} is equivalent to \eqref{pendulum} when <math>\mu\to 0</math> and <math>H(t)\ ,</math> <math>V(t)\ ,</math> and <math>\omega</math> are chosen appropriately.
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The model(1) is equivalent to(3) when <math>\mu\to 0</math> and <math>H(t)\ ,</math> <math>V(t)\ ,</math> and <math>\omega</math> are chosen appropriately.