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Why is the term ##(\sin\theta\,\dot{\theta})^2## fourth order in the small ##\theta##, as claimed by the sentence below (5.108)?
By small-angle approximation, ##(\sin\theta\,\dot{\theta})^2\approx\theta^2\,\dot{\theta}^2##.
For this to be fourth order, it seems like we must have ##\theta=\dot{\theta}##. Why is this true? What are the conditions for this to be true?
By small-angle approximation, ##(\sin\theta\,\dot{\theta})^2\approx\theta^2\,\dot{\theta}^2##.
For this to be fourth order, it seems like we must have ##\theta=\dot{\theta}##. Why is this true? What are the conditions for this to be true?