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Sep22-06, 05:48 AM
This's not the error.
If you think it this way, you cannot compute a derivative as well, since you're dividing with 0 when computing it as well. Note that I'm dividing 0 with 0, which is indefinite, and from than line on, all I did was to get rid of this indefinition.
Nobody who know calculus divides by 0 when finding a derivative!