对数导数的推导br 对数导数的推导 br D In x br GObr In x small x In x small xbr Gobr In 1 small x x small xbr Gobr In 1 small x x 1 small x br 设 small x x 1 t br Gobr In 1 1 t t x br Gobr Ine 1 x br GObr 1 x
对数导数的推导
D(In(x))
GO
{In(x+small_x)-In(x)}/small_x
Go
In(1+small_x/x)/small_x
Go
In {(1+small_x/x)}^(1/small_x)
设small_x/x=1/t,
Go
In (1+1/t)^(t/x)
Go
In e^(1/x)
GO
1/x
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