Use f(x) = 1
2
x and f -1(x) = 2x to solve the problems.

f(2) =
1

f−1(1) =
⇒ 2

f−1(f(2)) =
⇒ 2

f−1(−2) =
1
⇒ -4

f(−4) =
2
⇒ -2

f(f−1(−2)) =
2
⇒ -2

In general, f−1(f(x)) = f(f−1(x)) =