# How to express in sage f(x^(-1)) when I have f(x)?

f(x^(-1)) = ? how to calculate it if I have f(x).

How to express in sage f(x^(-1)) when I have f(x)?

f(x^(-1)) = ? how to calculate it if I have f(x).

1

It depends on how is `f`

defined. By lack of concrete example, let me provide one:

```
sage: f(x) = x^2
sage: f(x^(-1))
x^(-2)
```

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Asked: ** 2020-05-28 19:39:43 +0200 **

Seen: **208 times**

Last updated: **May 29 '20**

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You should provide an explicit example, since there are many ways to define

`f`

.