âThe Cask of Amontilladoâ (1846) Summary. The narrator, Montresor, opens the story by stating that he has been irreparably insulted by his acquaintance, Fortunato, and that he seeks revenge. He wants to exact this revenge, however, in a measured way, without placing himself at risk. He decides to use Fortunatoâs fondness for wine against him.
The first, which shows that the limit DOES exist, is if the graph has a hole in the line, with a point for that value of x on a different value of y. If this happens, then the limit exists, though it has a different value for the function than the value for the limit. Please click on the image for a better understanding.
Our limit is zero. Once we see through the disguise and identify the f(x), the rest is easy. This actually makes our friend Deriv quite happy. Lesson Summary. In some limit problems the limit value may be substituted to obtain an answer. In other problems, this is not possible because the denominator will be zero. In some cases the definition of the derivative f '(x) is disguised within the limit problem which leads to knowing f(x) and thus f '(x). These problems are known as derivatives in disguise.