2. Sketch the sets described below. (a) In cylindrical coordinates: 1 ≤ r ≤ 3,0 ≤ 0 ≤ 1,0 ≤ z ≤ 4. (b) In spherical coordinates: p≥ 1, 0 = 71, 7 ≤ ≤ 17.

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