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Assume that two matrices A, B are invertible. With the help of Mathematica show with one counterexample that (A B)-1 is not equal to A-1 B-1

 

6. Assume that two matrices A, B are invertible. With the help of Mathematica show with one counterexample that (A B)-1 is not equal to A-1 B-1

Is the Fibonnaci sequence rising faster than the exponential function?
I'm trying to evaluate the limit :::::
Limit[(sqrt[t^2 + 9] - 3)/(t^2), t -> 0]

When i click "evaluate cell" Mathematica outputs :::::

\!\(\*UnderscriptBox[\(\[Limit]\), \(t \[Rule] 0\)]\) (-3 +
sqrt[9 + t^2])/t^2

which is the same thing as what I typed in only in a slightly different order (essentially the same thing i typed in) what am i doing wrong ?
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