Difference between revisions of "AoPS Wiki:Problem of the Day/September 19, 2011"
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<math>\textbf{ (A)}f(x)=2f(z)\quad \textbf{(B)}x=f(z)\quad \textbf{(C)}</math><math>f(x)=f(z) \quad \textbf{(D)}x=2y\quad \textbf{(E)}\text{None of the above}</math> | <math>\textbf{ (A)}f(x)=2f(z)\quad \textbf{(B)}x=f(z)\quad \textbf{(C)}</math><math>f(x)=f(z) \quad \textbf{(D)}x=2y\quad \textbf{(E)}\text{None of the above}</math> | ||
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Latest revision as of 17:03, 19 September 2011
Let 
, and let the points 
and 
be on the graph of 
. Which of the following must be true?
