Question

For which function is f(x) equal to f-1(x)?

Answer 1

Suppose we have the following function:
 f (x) = x
 Looking for the inverse of the function we have:
 y = x
 Clearing x we have:
 x = y
 Rewriting we have the inverse is:
 f ^ -1 (x) = x
 Thus,
 f (x) = f ^ -1 (x)
 Answer:
 f (x) is equal to f-1 (x) for:
 f (x) = x