dri(t) · r2(t)] and ri(t) x r2(t)] first by differentiatin e dt luct directly and then by applying the formulas dr2, dri r2(t)] = r:(t) . dt r2(t) and dt x r2(t)] = r1(t) x dr2, dri dt x r2(t). dt %3D ri(t) = cos(t)i + sin(t)j + 3tk, r2(t) = 2i + tk %3D r2(t)] %3D < r2(t)]

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