I know that we start with $[A | I]$ matrix and after applying the method it becomes $[I | A^{-1}]$. My question is why this happens? Have we proved it or so? Thanks
How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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