作者LuisSantos (^______^)
看板trans_math
标题Re: [微分] 94成大国企
时间Mon Dec 3 00:22:31 2007
※ 引述《bitchdog (PEaCE)》之铭言：
: Y={[(1+x)^-1]+1]}^-1, find dy
: ----
: dx
1
y = ---------------
(1/(x+1)) + 1
1
= ----------------------
(1 + x + 1)/(x + 1)
1
= -----------------
(x + 2)/(x + 1)
x + 1 1
= ------- = 1 - --------
x + 2 x + 2
dy 1
---- = -----------
dx (x + 2)^2
--
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