Wednesday, July 6, 2016

How to calculate this limit without L'Hopital's rule

I know that in the very small values of $x$
$$(1+x)^n ≈1+ nx$$
and I can prove it using Taylor series.
But I wanted to prove it without any smell of derivative.



So... In order to calculate the following limit



$$\lim _{x \rightarrow\ 0} \frac{(1+x)^n-1} x, $$



I know that the result must be equal to $n$.




But is there any method without using l'Hospital's rule?



Note : n can be any real value not just for integers, so I didn't want to use binomial theorem.

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