d d. Calculate[r₁(t) · r2(t)] and [r₁(t) × r²(t)] first by differentiating dt 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 dr₁ [r₁(t) × r₂(t)] = r₁(t) × · + x r₂(t). dt dt dt r₁(t) = cos(t)i + sin(t)j +4tk, r₂(t) = 3i+ tk d [r₁(t) · r₂(t)] = [3 i + tk X dt dri(t) [r₁(t) x r₂(t)] = 3i+7k X

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