Question: If u(t) = r(t) [r'(t) r(t)], show that u'(t) = r(t) [r'(t) r'(t)]

If u(t) = r(t) · [r'(t) × r"(t)], show that

u'(t) = r(t) · [r'(t) × r"'(t)]

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