For f -LRB- x -RRB- with domain and range both nonnegative reals , how many f -LRB- x -RRB- are there where f -LRB- f -LRB- x -RRB- -RRB- = x ^ 2 ? Are there more than 2 ?
What are all the functions where -LSB- math -RSB- f -LRB- f -LRB- x -RRB- -RRB- = x ^ 2 -LSB- / math -RSB- with domain nonnegative reals ? Are there more than two ?