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Functionshard
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Consider the function f(x)=ax+bcx+df(x) = \frac{ax+b}{cx+d}f(x)=cx+dax+b​ where ad−bc≠0ad-bc \neq 0ad−bc=0. If f(f(x))=xf(f(x)) = xf(f(x))=x for all xxx in the domain, which condition must be true?