1. integral from 0 to pi (-2xsinx)
2. 我想問d/dx x^2sinx = x^2cosx+2xsinx,可唔可以x^2cosx= -2xsinx?因為呢兩個integral from 0 to pi 左都係-2pi
help thx
收錄日期: 2021-04-13 17:48:26
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https://hk.answers.yahoo.com/question/index?qid=20110206000051KK00015