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It's good to have a feel for what continuity at a point looks like in pictures. However, sometimes we are asked about the continuity of a function for which we're given a formula, instead of a picture. When this happens, remember that the following three statements must all hold for f to be continuous at c.

  1. I. The function f is defined at x = c.
  2. The limit  exists.
  3. The value f(c) agrees with the limit .
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