Sunday, August 14, 2016

calculus - limxrightarrow0+frac(1+cosx)(ex1)=infty using l'Hopital

I need to show lim



I know that, say, if you let
f(x) = 1 + \cos x
and
g(x) = \dfrac{1}{e^x-1},
and then multiply the limits of f(x) and g(x), you get \frac{2}{0}. I can't figure out how to make it work for l'Hopital's rule however, i.e. how to rewrite it so that it is in the form \frac{0}{0} or \frac{\infty}{\infty}.




I also tried multiplying h(x) by the conjugate of f(x), but I don't think this is fruitful. Any hints appreciated.

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