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I did the same problem on my white board with out looking at your answer and I received the same thing.
Your answer is entirely correct!
Your answer is entirely correct but you could have done it easier and shorter. (Using L' Hopital's Rule)
You're right, but the problem is that for some reasons l'Hopital is used in cases where it's the only option and avoided in cases where you could solve the limit in a different way.
And, of course, here we do not know if Sparky has covered L'Hopital's rule or even differentiation yet in his class.
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