$\"\"$

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The equation is $\"\"$ .

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Let $\"\"$ then $\"\"$ .

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$\"\"$

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Find the volume $\"\"$ .

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$\"\"$

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If $\"\"$ then $\"\"$ .

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If $\"\"$ then $\"\"$ .

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Substitute all the values in the integral.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$

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Apply formula : $\"\"$ .

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$\"\"$

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$\"\"$ $\"\"$

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$\"\"$

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The volume is $\"\"$ .