
Differential Equations Ordinary and Partial Differential Equations Math Forum 
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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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additional, diffeqs, formula, function, tangent 
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