Wednesday, April 2, 2014

Verify if limit of ln(1+x)/x is 1, x-->0

In other words, we'll have to prove
that:


lim [ln(1+x)]/x =
1


We'll re-write the
function:


lim (1/x)*ln(1+x) =
1


We'll apply the power property of
logarithms:


lim  ln [(1+x)^(1/x)] = ln lim
[(1+x)^(1/x)]


But, for x->0 lim [(1+x)^(1/x)] = e
(remarcable limit)


lim  ln [(1+x)^(1/x)] = ln
e


We know that ln e =
1


So, for x->0, lim  ln [(1+x)^(1/x)]
= 1.

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