integral from 0 to 2pi integral from 0 to 3 [r((-1+r cos t)³ - 3(-1+r cos t)r²sin²t)] dr dtintegral from 0 to 2pi integral from 0 to 3 [r((-1+r cos t)³ - 3(-1+r cos t)r²sin²t)] dr dt

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