Inverse Functions | Derivatives of Inverse Functions | Math@TutorVista.com
There are two simple theorems related to inverse functions. Theorem 1: Let $f(x)$ and $g(x)$ are two functions of a single variable. If $(fog)(x)$ and $(gof)(x)$ are both the same and if both are equal to $x$, then $f(x)$ and $g(x)$ are inverse functions ...