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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 ?