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Think about the function `f(x)=(x-4)/(x-4)` .
If you put in any number except 4, the function returns 1. But if you put in 4, you get 0/0, which is undefined. Since the limit as x approaches 4 never involves x=4, we have `lim_(x->4)f(x)=1` but ``f(4) is undefined.
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