I want to determine all continuous functions s.t. for all x, y reals:(adsbygoogle = window.adsbygoogle || []).push({});

f(x+y)f(x-y) = {f(x)f(y)}^2

Now, I want to know where on the web I can learn how I go about doing this, because I dont know what methods to use or what I should be aiming at in manipulating the above.

I dont want an answer - - I just want to know how to go-about if I want to do this....rather like how I know how to calculate the two roots of an equation, I'd go about factorising for example.

Thank you!

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# Determining All Continuous Functions s.t.

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