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## Homework Statement

(a) f(x) = 5x^7+6x^3+x+9. Knowing that f(-1)=-3 and that f is invertible, find f '^-1(-3)

(b) g(x) = e^x/ (e^x+1) What's g^-1(x) = ?

## Homework Equations

I think i'm supposed to use this equation

## The Attempt at a Solution

I tried to put x in evidence, but that led me nowhere. I'm clueless in both exercises...

Thanks

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