Let $\displaystyle {f{{\left({x}\right)}}}={\frac{{{1}-{2}{x}}}{{{1}+{2}{x}}}}$.
Then $\displaystyle {f}'{\left({2}\right)}$ is Preview Question 6 Part 1 of 2  

and $\displaystyle {f}{''}{\left({2}\right)}$ is Preview Question 6 Part 2 of 2