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

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