dCalculate ri(t) · r2(t)] and ri(t) × r2(t)] first by differentiatingddtdtthe product directly and then by applying the formulasddr2dri[r1(t) · r2(t)] = r1(t) ·dtr2(t) anddtdtddr2dri[ri(t) × r2(t)] = r¡(t) ×dtx r2(t).dtdtri(t) = 2ti + 7t°j + 8t°k, r2(t) = t*kd[ri(t) - r2(t)] =dt[r1(t) × r2(t)] =

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d Calculate ri(t) · r2(t)] and ri(t) × 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) · dt r2(t) and dt dt d dr2 dri [r1(t) × r2(t)] = r¡(t) × dt x r2(t). dt dt ri(t) = 2ti + 7tj + 8t°k, r2(t) = t*k d ri(t) - r2(t)] = dt [r1(t) × r2(t)] =