The region is bounded by the curves , and .

The solid is revolving about the -axis.

Washer method: .

Find the volume of the solid in .

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(a)

Find the value of in the that divides solid into two parts of equal volume.

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divides the solid into two parts of equal volume.

(b)

Find the value of in the that divide the solid into three parts of equal volume.

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divide the solid into three parts of equal volume.

(a)  divides the solid into two parts of equal volume.

(b) divide the solid into three parts of equal volume.