Difference between revisions of "2002 IMO Problems/Problem 5"
(Created page with "==Problem== Find all functions <math>f:\Bbb{R}\to \Bbb{R}</math> such that <cmath>(f(x)+f(z))(f(y)+f(t))=f(xy-zt)+f(xt+yz)</cmath> for all real numbers <math>x,y,z,t</math>...") |
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