Question
Evaluate the following limits:
$\lim _{u \rightarrow 1}\left[\frac{u^4-1}{u^3-1}\right]$
$\lim _{u \rightarrow 1}\left[\frac{u^4-1}{u^3-1}\right]$
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$\lim _{x \rightarrow-2}\left[\frac{-2 x-4}{x^3+2 x^2}\right]$