d d Calculate r(t)· r2(t)] and dt [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 dt dt d dr2 dri [r1(t) x r2(t)] = ri(t) x dt x r2(t). dt dt ri(t) = cos(t)i + sin(t)j+ 6tk, r2(t) = 5i + tk

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