## Inverse of a Function

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**1**of**1**- PsySc0rpi0n
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**Posts:**40**Joined:**Tue Dec 17, 2013 12:56 pm**Calculators:**Casio fx-9860 GII, Casio Classpad fx-cp400

### Inverse of a Function

Hello again.

I know I can plot te inverse of a function. But is it possible to analytically evaluate the expression of the inverse function of a given expression?

I know I can plot te inverse of a function. But is it possible to analytically evaluate the expression of the inverse function of a given expression?

- lephe
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**Posts:**40**Joined:**Fri Aug 21, 2015 11:54 am**Location:**France**Calculators:**Casio fx-9750 G II, Casio fx-9750 G II (SH4), Casio fx-9860 GII, Casio fx-CG 50

### Re: Inverse of a Function

You could just rotate the calculator 90°. Otherwise you're stuck with the serious problem that only few functions are invertible; an analytical inversion process seems out of the question. Even polynomials are mostly not injective, so you're definitely not going to get an expression by calling a built-in calculator functionality.

- PsySc0rpi0n
- Member
**Posts:**40**Joined:**Tue Dec 17, 2013 12:56 pm**Calculators:**Casio fx-9860 GII, Casio Classpad fx-cp400

### Re: Inverse of a Function

Well, maybe if I describe the problem, it gets easier to understand.

I'm testing an electronic circuit and I'm registering some values I'm reading with the scope from that circuit. With those values, I plot a curve in a Spreadsheet. Then I ask the Spreadsheet program to give me the Trend Line expression using the Quadratic Law. After that I wanted to obtain the inverse function of the expression SpreadSheet gave me. I'm doing it by hand but if the calculator could give it to me, it was great!

I'm testing an electronic circuit and I'm registering some values I'm reading with the scope from that circuit. With those values, I plot a curve in a Spreadsheet. Then I ask the Spreadsheet program to give me the Trend Line expression using the Quadratic Law. After that I wanted to obtain the inverse function of the expression SpreadSheet gave me. I'm doing it by hand but if the calculator could give it to me, it was great!

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