(i)If f(x) is a polynomial function 0,\infty)\rightarrow(0,\infty)" alt="f0,\infty)\rightarrow(0,\infty)" />satisfies the equation f(f(x))=6x-f(x)then find f(17)

(ii)If f(x) is a polynomial function satisfying the condition such that f(x^2+1)=(f(x))^2+1 and that f(0)=0 then find f(34).