Set up an integral that represents the area of the surface obtained by rotating the given curve

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Set up an integral that represents the area of the surface obtained by rotating the given curve about the -axis. Then use your calculator to find the surface area correct to four decimal places.
(a) x = t sin t, y = t cos t, 0 ≤ t ≤ π/2.
(b) x = 1 + tet, y = (t2 + l)et, 0 ≤ t ≤ 1.
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