[微積] 關於lnx加不加絕對值...
不好意思請教一下
最近在重看微積分,看到求X^X的微分,我知道是要先換成e^XlnX的形式再微分
然後答案是(lnX+1)X^X
可是我想問的是答案的lnX可不可以寫成ln|X|呢?
因為記得不定積分的時候如果答案有ln的形式出現都要加絕對值,那麼微分
的答案加絕對值會有影響嗎?
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