please solve d/dx[In(u)]?

👨🏻‍🏫 學術台數學

錢老爺

2015-11-06 6:34 am

回答 (1)

螞蟻雄兵

2015-11-06 6:56 am

Sol
solve dlnx/dx
Set y=lnx
e^y=x
dlnx/dx
=dy/de^y
=(de^y/dy)^(-1)
=(e^y)^(-1)
=x^(-1)
=1/x
dlnu/dx=0

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