1.

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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