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For a suitabily chosen real constanat ...

For a suitabily chosen real constanat a let a fuction , `f: R ~[~a] to R ` be defined by `f(x) = (a-x)/(a+x)` . Further suppose that for any real number ` x ne - a` and `f(x) ne = 2` (fof) (x) = x . Then `f(-(1)/(2))` is equal to :

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