The cylindrical shell radius you are looking for is (2+x) and not (1+x). As the rotation is of area between x=−1 and x=0, around x=−2,. ... <看更多>
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The cylindrical shell radius you are looking for is (2+x) and not (1+x). As the rotation is of area between x=−1 and x=0, around x=−2,. ... <看更多>