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1/(1-x)ªº¿n¤À
¥un¬O1/x©Î1/(x-c)©Î1/(c-x),
c¬°±`¼Æ³£·|Åܦ³ln|x|©Îln|x-c|©Î-ln|c-x|
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1/x¿n¤À
xdx*ln|x|=1*ln|x|=ln|x|
1/(x-c)¿n¤À
(x-c)dx*ln|(x-c)|=1*ln|(x-c)|
©Ò¥H1/(c-x)¿n¤À
(c-x)dx*ln|(c-x)|=-1*ln|(c-x)|