If f(x)+f(y)+f(xy)=2+f(x)f(y) for all x,...

If f(x)+f(y)+f(xy)=2+f(x)f(y) for all x, y in R and f(x) is a polynomial function with f(4)=65 then find the value of `(f(5))/(7)` is (where f(1)`ne`1) .

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