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sin2x是f(x)的一個原函數 所以∫f(x)dx=sin2x+C 定積分就是就求原函數的集合,∫f(x)dx代表的意思是,求f(x)這個函數的原函數的集合. sin2x是f(x)的一個原函數,把sin2x加上任意常數C,都是f(x)的原函數
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