f(f(x)) = x² - x + 1
f(0) = ?
(@edsaperia inflicted this on me earlier :P )
why do you believe f(f(x)) = f(x)f(x)? [e.g. if f(x)=x^3, then f(f(x))=x^9 but f(x)f(x)=x^6 ]
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ok, I got this backwards. f(x) = 1-x, f(0)=1!
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