[问答题]
1. By successive differentiation find the first five non-zero terms e8ktgw)zl4) lin the7 ov-+ondvty h:mbkm ,./5nm d Maclaurin series fornb 7od y,vn/:dvmmhk5+.om t- $f(x)=(2-2 x) \ln (1-x)+2 x $.
2. Deduce that, for $n \geq 2$ , the coefficient of $x^{n}$ in this series is $\frac{2}{n(n-1)}$ .
