The function f f\,f is defined by
f(x)=1x+2\displaystyle f(x) = \frac{1}{x + 2}f(x)=x+21, x∈Rx \in \mathbb{R}x∈R, x≠−2x \neq -2x=−2
Using set notation, write down the range of fff.
Find an expression for f−1(x)f^{-1}(x)f−1(x) and, using set notation, state its domain.