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If 'f' is a polynomial such that f ((1-x...

If 'f' is a polynomial such that `f ((1-x)/(1+x))f((1+x)/(1-x))=f((1-x)/(1+x))+f((1+x)/(1-x))` ( where `x != 0, pm 1` ) and `f(3)=28` then the value of `(1)/(605) ( sum_(n=1)^(10) (f(n)-1))` is

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