d d Calculate[ri(t) r2(t)] and [r₁(t) × r₂(t)] first by differentiating dt 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) = cos(t)i + sin(t)j + 3tk, r₂(t) = 2i + tk d dt = [r₁(t) · r₂(t)] = = d dt [r₁(t) × r₂(t)] =

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