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

If u(t) = r(t)? [r'(t) X r''(t)], show that

 u'(t) = r(t) ? [r'(t) X r-(t)]

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