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 dr2, dri r:(t) - r2(t)] = r1(t)- r2(t) and dt dt dt dri dr2 r:(t) x r2(t)] =r¡(t) × x r2(t). dt dt ri(t) = cos(t)i + sin(t)j+ 8tk, r2(t) = 7i+ tk [r(t) r2(t)] dt

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