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由輪換對稱性 ∫∫x²;ds=∫∫y²;ds =(1/2)∫∫(x²;+y²;)ds =(1/2)∫∫a²;ds =(a²;/2)∫∫1ds 被積函數為1,積分結果為曲面面積 =(a²;/2)*(2πah) =πa³;h
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