-9 -6 Arc length: 9 -3 6 3 3 6 ∞o -3 -6 -9 In the animation above you can see a curve that is traced by a point on the perimeter of a circle rolling around another circle of the same radius. The parametric presentation of this curve is r(t) = [z(t)] [8] = [ Find the arc length of the curve. - [3(2 cost – cos 2t) 3(2 sin tsin 2t) 31₁ t = [0, 2π),

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