An algebra problem by madhav srirangan

Let $f(x)=x^{100}+x^{99}+\ldots+x+1$

$x_1,x_2,\ldots,x_{100}$ are the roots of $f(x)=0$ .

Find $\displaystyle \sum_{i=1}^{100} \dfrac{1}{(1-x_{i})^{2}}$ .