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FL
Problem 12

# Evaluate $\int_{C} \sqrt{x^{2}+y^{2}} d s$ along the curve $\mathbf{r}(t)=(4 \cos t) \mathbf{i}+$ $(4 \sin t) \mathbf{j}$ $+3 t \mathbf{k},-2 \pi \leq t \leq 2 \pi.$

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## Video Transcript

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