Question about a LIMIT problem , calculus class?

Castle

New member
http://i904.photobucket.com/albums/ac250/klh1189/limit1.jpg?t=1283847091
That is the problem, when you do these kinds of problems what do you, because it says the answer is zero, but HOW do they know this?
what I did was don't you just figure out what makes the domain undefined and then that should be your limit right ? Is that not how do you these?
 
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