d d Calculate ri(t) · r2(t)] and [r:(t) x r2(t)] first by differentiating dt dt the product directly and then by applying the formulas d dr dr2 r(t) · r2(t)] = r1(t) ·. r2(t) and dt dt dt d dr2 dri ri(t) x r2(t)] = r:(t) × x r2(t). dt dt dt ri(t) = cos(t)i + sin(t)j + 7tk, r2(t) = 6i + tk d dri(t) - r2(t)] d r:(t) x r2(t)] dt

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