Question: If r(t) is a nonzero differentiable function of prove that d dt (r(t)) = 1 r(t)|| r(t). r'(t).

If r(t) is a nonzero differentiable function of prove that

d dt (r(t)) = 1 r(t)|| r(t). r'(t).

d dt (r(t)) = 1 r(t)|| r(t). r'(t).

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