d Calculate [ri(t). r₂(t)] and 777[r1(t) × r₂(t)] first by differentiating dt dt the product directly and then by applying the formulas d dt d dit dr₂ dri . [r₁(t) · r₂(t)] = r₁(t). + • r₂(t) and dt dt d dt dr₂ dri [r₁(t) × r₂(t)] = r₁(t) x + x r₂(t). dt dt r₁(t) = 6ti + 2t²j + 4t3³k, r₂(t) = t¹k d dri(t) r₂(t)] · = [r₁(t) × r₂(t)]: =

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