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 dri d dr2 ri(t) · r2(t)] = ri(t) · r2(t) and dt dt dt dr2 dri x r2(t). d [r(t) x r2(t)] = r;(t) x dt dt dt r:(t) = 7ti + 9t²j +4t°k, r2(t) = t*k d [ri(t) · r2(t) : dt d r:(t) x ra(t) =

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A: We have given;

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A:

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A:

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A:

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A:

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A:

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A:

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Q: Find:

A: Given,

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A:

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A:

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A:

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A: Simplification