d d Calculate[ri(t) r₂(t)] and[r₁(t) × r₂(t)] first by differentiating dt the product directly and then by applying the formulas d dr₂ dri [r₁(t) · r₂(t)] = r₁(t). + · r₂(t) and dt dt dt d dr2 dri [r₁(t) × r2(t)] = r₁(t) × + x r₂(t). dt dt dt r₁(t) = 9ti + 3t²j+8t³k, r₂(t) = t¹k d [ri(t) r₂(t)]= = dt [ri(t) x r₂(t)] (1) x. d dt =

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