$\int \large\frac{7x^8+8x^7}{(1+x+x^8)^2}dx$$=f(x)+c => f(x)=$

Question

\[\begin {array} {1 1} (1)\;\frac{x^8}{1+x+x^8} & \quad (2)\;28 \log (1+x+x^8) \\ (3)\;\frac{1}{1+x+x^8} & \quad (4)\;\frac{-1}{1+x+x^8} \end {array}\]