The function f f\,f is defined by
f(x)=3+ln(5x−4)f(x) = 3 + \ln(5x - 4)f(x)=3+ln(5x−4), x∈Rx \in \mathbb{R}x∈R, x>45\displaystyle x > \frac{4}{5}x>54
Find the exact value of ff(1)ff(1)ff(1).
Find an expression for f−1(x)f^{-1}(x)f−1(x).