Let A be a square matrix. Another square matrix B is called inverse of A if AB=BA=I.
My question is whether just AB=I or BA=I is not sufficient to call B as the inverse of A? If it is not, then give a counter example where AB=I, but AB≠BA.
How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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