d d Calculateri(t) r2(t)] and 77[r1(t) × r²(t)] first by differentiating the product directly and then by applying the formulas d. dr₂ dr₁ [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 + 2tk, r₂(t) = i + tk d dt dt [r₁(t) · r₂(t)] = [ = [r₁(t) × r2(t)] : =

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