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1- Find the exact area of the surface obtained

by rotating the curve about the x-axis.

yx^3 /2 + 1/ 6x ,    1/2 ≤ x ≤ 1


2- Find the exact area of the surface obtained by rotating the curve about the x-axis.

x = 1/3 (y2 + 2)3/2,    4y5


3- The given curve is rotated about the y-axis. Find the area of the resulting surface.

y = 1/3 x3/2,    5x21

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