I am given some limits that exist, I'm supposed to find their values. Seems really simple however I am struggling.
Find the value of $\displaystyle \lim_{z\to\\i}\frac{z^4 - 1}{z-i} $.
My approach was to paramaterize $z$ to $it$ and transform the limit to something like:
$\lim_{t\to\\1}\frac{(it)^4 - 1}{it-i} $
Could anyone lend a hand as to how to solve something like this?