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 January 23rd, 2015, 07:41 PM #11 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,671 Thanks: 2651 Math Focus: Mainly analysis and algebra The original equation we were given.$$f(x+y) = {f(x)+f(y) \over 1 - f(x)f(y)}$$ An example for which $x = \frac\pi2$ is not significant is $f(x) = \tan {x \over \pi}$.
 January 29th, 2015, 11:33 AM #12 Global Moderator   Joined: Dec 2006 Posts: 20,835 Thanks: 2162 For what values of $x$ and $y$?

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