Let f--1 = 1/f

find an example of such a function, where the domain of f
consistsof a single point.

For all real numbers x, define the function f by f(x)=0 if x≠1 and f(1)=2.

Step-by-step explanation:

The domain of f is the set of real numbers (R). To define at a point x, we need that f(x)≠0 as division by zero is undefined.

However, there is only one point x such that f(x)≠0, the point x=1.

Thus and the domain of is the set {1}.

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