Calculate ri(t) · r2(t)] and ri(t) × r2(t)] first by differentiating dt dt the product directly and then by applying the formulas d [r:(t) · r2(t)] = r1(t) • dr2 dri + dt r2(t) and dt dt dri d r:(t) x r2(t)] = r;(t) × dr2 + dt x r2(t). dt dt ri(t) = 6ti + 9t°j + 8t°k, r2(t) = t*k %3D %3D d diri(t) · r2(t)] = d ri(t) x r2(t)] dt

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