d d Calculate ri(t) · r2(t)] and ri(t) × r2(t)] first by differentiating dt dt the product directly and then by applying the formulas dri d [r:(t) · r2(t)] = r1(t) • dr2 r2(t) and dt dt dt d [ri(t) x r2(t)] = r1(t) x dri x r2(t)- dr2 dt dt dt ri(t) = 2ti + 5tj + 5t°k, r2(t) = t'k d [ri(t) · r2(t)] d [r:(t) x r2(t)] = dt

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