finverse(f) returns a function g, such that g(f(x))=x, where x is a variable found by findsym.

finverse(f, y) returns a function g, such that g(f(y))=y.

$\mathrm{with}\left(\mathrm{MTM}\right)\:$

$t≔2+{\left(3+4\log \left(x\right)\right)}^2-5\log \left(x\right)\:$

$\mathrm{finverse}\left(t\right)$

${\ⅇ}^{-\frac{19}{32}+\frac{\sqrt{-343+64x}}{32}}$

$\mathrm{finverse}\left(p\sin \left(x\right)+r\,x\right)$

$-\arcsin \left(\frac{r-x}{p}\right)$

$\mathrm{finverse}\left(\frac{1}{\tan \left(x\right)}\right)$

$\arctan \left(\frac{1}{x}\right)$

$\mathrm{finverse}\left(x^2+y\,y\right)$

$-x^2+y$

$\mathrm{finverse}\left(x^2+y\right)$

$\sqrt{x-y}$