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28 June, 15:38

Find the area of the surface obtained by rotating the curve y x2 0 ≤ x ≤ 2 about the y axis

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  1. 28 June, 17:30
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    ds = √ 1 + (dy dx) 2 dx = √ 1 + 14 (x4 - 2 + 1 x4) dx

    = √ 14 (x4 + 2 + 1 x4) dx = √ 1 22 (x2 + 1 x2) 2 dx

    = 12 (x2 + 1 x2) d x
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