d Calculate ri(t) · r2(t)] and d [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 d dr2 dri dt r1(t) x r2(t)] = r1(t) × x r2(t). dt dt ri(t) = 8ti + 8t°j + t³k, r2(t) = tʻk %3D d r:(t) · r2(t)] = d dr(t) x r2(t)] = |

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