A torus of radius 3 (and cross-sectional radius 1) can be represented parametrically by the function r : D → R³: r(0, 6) = ((3 + cos 6) cos 0, (3 + cos 6) sin 0, sin 6) where D is the rectangle given by 0 ≤ 0 ≤ 2π, 0 ≤ ¢ ≤ 2π. The surface area of the torus is

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