AoPS Wiki:Problem of the Day/September 19, 2011
< AoPS Wiki:Problem of the Day
Revision as of 16:07, 19 September 2011 by Negativebplusorminus (talk | contribs) (Created page with "Let <math>f(f(x))=x</math>, and let the point <math>(x,y)</math> and <math>(y,z)</math> are on the graph of <math>f(x)</math>. Which of the following must be true? <math>\textb...")
Let , and let the point and are on the graph of . Which of the following must be true?