Chapter 12, Section 12.2, Question 029 d Calculate [ri (t) · r2 (t)] and [ri (t) × r2 (t)] first by differentiating the product directly and then by applying the formulas dt d dr2 drį d dr2 dri [ri (t) · r2 (t)] = r¡(t) · + dt r2(t) and [ri (t) × r2 (t)] = r¡ (t) X dt x r2(t). dt dt dt dt ri (1) = 7ti+ 21?j+8³ k, r2(t) = t^ k d 元r()-r2()] = Edit d [r](t) × r2(t)] = dt ? Edit i+ ? Edit

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