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March 1, 2015

March 1, 2015

Posted by **Cait** on Friday, March 2, 2012 at 8:28am.

y = x2, y = 1; about y = 6

- Calc2 -
**MathMate**, Friday, March 2, 2012 at 10:54amHint: use the disk method

Find the intersection of x² and y=6, which is x=±sqrt(6).

You may want to integrate with x=-sqrt(6) to +sqrt(6)

πf(x)^2 dx [equiv. to πr²]

where

f(x)=x²-1 [i.e. from y=1 to y=x^2]

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