d Calculate ri(t) · r2(t)] and ri(t) x r2(t)] first by differentiating d dt dt the product directly and then by applying the formulas d dr2, dri r:(t) - r2(t)] = r;(t) · r2(t) and dt dt dt d. [r(t) x r2(t)] = ri(t) x + dt dr2 dri x r2(t). dt dt ri(t) = 2ti + 8t°j + 6t°k, r2(t) = t'k d [ri(t) · r2(t)] : dt d [r:(t) x r2(t)] = dt

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