d d Calculate ri(t) · r2(t)] and r(t) × r2(t)] first by differentiating dt dt the product directly and then by applying the formulas d [ri(t) · r2(t)] = ri(t) · dr2, dri r2(t) and dt dt dt d dr2 , dri [ri(t) × r2(t)] =ri(t) x dt x r2(t). dt dt ri(t) = 6ti + 9t?j+5t°k, r2(t) = t*k d [r(t) · r2(t)] dt d [ri(t) x r2(t)] = dt

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