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Differential Equations Ordinary and Partial Differential Equations Math Forum

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January 23rd, 2015, 07:41 PM   #11
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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 $f(x) = \tan {x \over \pi}$.
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January 29th, 2015, 11:33 AM   #12
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For what values of $x$ and $y$?
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