Let S = $(D), where D = {(u, v) : u² + v² ≤ 9,u ≥ 0, v ≥ 0} and Þ(u, v) = (2u + 1, u – v, 3u + v). (a) Calculate the surface area of S. (Express numbers in exact form. Use symbolic notation and fractions where needed.) area(S) = (b) Evaluate (4x – 4y) dS. Hint: Use polar coordinates. (Express numbers in exact form. Use symbolic notation and fractions where needed.) (4 (4x - 4y) ds = S

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