題組內容
4. (1) Compute the area of the region
D =｛(x,y) /4x2 ≤ y ≤ (4x +1)2+3 and y ≤ 4)｝.
D =｛(x,y) /4x2 ≤ y ≤ (4x +1)2+3 and y ≤ 4)｝.
(2) Let 
be the centroid of D. Find 
.
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(2) Let be the centroid of D. Find .