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If $f(x)=\frac{ax+b}{cx+d}, abcd\not=0$ and $f(f(x))=x$ for all $x$ in the domain of $f$, what is the value of $a+d$?

 Mar 9, 2020
 #1
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Alcumus right?  I got zero for this problem yesterday because a = -b.

 Mar 15, 2020

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