d d Calculate (ri(t) · r2(t)] and [ri(t) x r2(t)] first by differentiating dt the product directly and then by applying the formulas dr2 dri d [ri(t) r2(t)] = ri(t). r2(t) and dt %3D dt dt d dr2 = r1(t) x dri di ri(t) × r2(t)] x r2(t). dt dt r1(t) : cos(t)i + sin(t)j + 5tk, r2(t) = 4i + tk

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