Find the length of the helix $r(t) = \langle 3\cos(2t), 3\sin(2t), 8t\rangle$ on the interval $[0, \pi]$. Hint: $s = \int_a^b ||r'(t)||\,dt$.
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r'(t) = (-6sin(2t), 6cos(2t), 8) Show more…
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