(Step-by-Step) Evaluate at t = 1 the derivative of the magnitude of || r (t) ||. Remember to write only the result. r(t)=t^2 i+sen; t j+ cos t k, u(t)=(1)/(t^2)
Question: Evaluate at t = 1 the derivative of the magnitude of || r (t) ||. Remember to write only the result.
\(\mathbf{r}(t)=t^{2} \mathbf{i}+\operatorname{sen} t \mathbf{j}+\cos t \mathbf{k}, \quad \mathbf{u}(t)=\frac{1}{t^{2}} \mathbf{i}+\operatorname{sen} t \mathbf{j}+\cos t \mathbf{k}\)
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