d d. Calculate ri(t) · r2(t)] and [ri(t) x r2(t)] first by differentiating dt dt the product directly and then by applying the formulas dr2 dr1(t) - r2(t)] = r1(t) · d dri · r2(t) and dt dt d dri x r2(t). dr2 dt ri(t) x r2(t)] =ri(t) x + dt dt ri(t) = 5ti + 3tj + 8t°k, r2(t) = t*k d ri(t) r2(t)] = 32 tº k dt d Iri(t) x r2(t)) = 1 18 to i+ 25 t j +C X

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