42. Derivatives of triple scalar products a. Show that if u, v, and w are differentiable vector functions of t, then du v X w + u• dt dv X w + u•v X dt dw (u•v X w) dt dt b. Show that d'r dr? dr dr d'r dt dt r. dt dr? (Hint: Differentiate on the left and look for vectors whose products are zero.)

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