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In Exercises 37-42, sketch the surface of revolution formed when the given function on the specified interval is revolved around the z-axis and find a function of two variables with the surface as its graph. A 37. If(x) = x, [0, 3] 38. f(x) = Vx, [0, 4] 39. f(x) - xz, [0, 2] 40. f(x) - x -3/2, [0, 1] 41. f(x) = sinx, 10, , 42. f(x) = cosx, |0