is x to the power -1 is a rational function?how?

The function is x-1 which is equal to 1/x.

Now, 1/x is the ratio of a constant polynomial function(i.e 1) and a monomial(i.e x).

Hence as its the ratio of two functions, its a rational function.

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why dont be write it as x to the power -1 divided by 1 and say it is note a rational function.

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