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[" (TTH) "],[" 16."taf(x)/(x)f(x)=(x)/(x...

[" (TTH) "],[" 16."taf(x)/(x)f(x)=(x)/(x)" at fees "(f(a/b))/(f(b/a))=(a)/(b)],[" 17."ath f(x)=(1-x)/(1+x)" at fites chet for "(f(a)-f(b))/(1+f(a)f(b))=(b-a)/(1+ab)]

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