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 dr2 dri d [ri(t) - r2(t)] = r1(t) : r2(t) and dt dt dt dri x r2(t). dr2 [ri(t) x r2(t)] =r¡(t) × dt dt dt ri(t) = cos(t)i + sin(t)j+ 3tk, r2(t) = 2i+ tk d [ri(t) · r2(t)] dt

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