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April 18, 2015

Posted by **jump** on Monday, December 3, 2012 at 10:41pm.

- calculus -
**Steve**, Monday, December 3, 2012 at 11:36pmcheck to be sure that the graph lies all on one side of the axis for the interval. It does.

So, volume is

v = ∫[0,1] pi (R^2-r^2) dx

where R = 3, r = 3-y

= pi∫[0,1] 9 - (3-(x^3-x^5))^2 dx

= pi∫[0,1] -x^10 + 2x^8 - x^6 - 6x^5 + 6x^3 dx

= pi(-1/11 x^11 + 2/9 x^9 - 1/7 x^7 - x^6 + 3/2 x^4) [0,1]

= 677/1386

- calculus -
**Steve**, Monday, December 3, 2012 at 11:37pm*pi

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