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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 \(a+d\)?

 Apr 5, 2020
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As seen by the example f(x) = (x + 1)/(-x + 1), a + d = 2.

 Apr 5, 2020

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