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Multivariable CalculusMediumCurves & Motion

Curves & Motion · Medium problem

Find the length of the helix r(t)=(1cos⁡t, 1sin⁡t, 3t)\mathbf r(t) = (1\cos t,\ 1\sin t,\ 3t) for 0≤t≤π0 \le t \le \pi. Give an exact answer.