Right, left, and bidirectional limits of symbolic
expressions and functions

`limit` |
Compute a limit |

Suppose, you have a function `f(x)`

.

If a limit of a function at a particular value of a variable
does not exist, the `limit`

command
returns `undefined`

.

If the `limit`

command
cannot compute a limit of a function at a particular point and also
cannot prove that the limit is not defined at this point, the command
returns an unresolved limit:

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