et r be a three-dimensional real vector-valued function such that r′′ exists. Show that d/dt [r(t) ×r′(t)] = 1/3 r′′(t) ×−3r(t).

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2. Let r be a three-dimensional real vector-valued function such that r′′ exists.
Show that d/dt [r(t) ×r′(t)] = 1/3 r′′(t) ×−3r(t).

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