Posted by Anonymous on Sunday, March 7, 2010 at 3:32pm.
Evaluate the limit approaching 1 from both x>1 and x<1 directins. The x-1 terms will get switched in sign in the latter case.
Use L'Hopital's rule and see if the limit is the same in both directions.
For x-> 1 from above, the limit is 2x + 1 = 3
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