Question: If r(t) 0, show that 1 -r(t) r'(t). d |r()|= Tr()| dt

If r(t) ≠ 0, show that

1 -r(t) r'(t). d |r()|= Tr()| dt

1 -r(t) r'(t). d |r()|= Tr()| dt

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