d Calculate r1(t) - r2(t)] and dt [r:(t) x r2(t)] first by differentiating dt the product directly and then by applying the formulas d dr2 dri [r:(t) r2(t)] = r:(t) . dt r2(t) and dt dt d. dr2 dri [ri(t) × r2(t)] = r1(t) x dt x r2(t). dt dt ri(t) = 8ti + 4t'j+ 3t°k, r2(t) = t*k d [r(t) · r2(t)] dt d [r(t) × r2(t)] dt

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