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Question Number 74359 by jagannath19 last updated on 23/Nov/19
Commented by mr W last updated on 23/Nov/19
$$\left(\mathrm{1}\right)\:{is}\:{correct} \\ $$$${but}\:{both}\:\left(\mathrm{1}\right)\:{and}\:\left(\mathrm{4}\right)\:{are}\:{in}\:{order},\:{since} \\ $$$$\alpha\Delta\theta\ll\mathrm{1} \\ $$