1. Find the length of the curves: a) r(t) = (t, 3 cos t, 3 sin t ), -5 ≤ t ≤ 5 b) r(t) = √ēti + e¹j+e-¹k, 0≤ t ≤ 1 = 2y and the surface 3z = xy. Find c) Let C be the curve of the intersection of the parabolic cylinder x² the exact length of C from the origin to the point (6,18,36)

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