Find the anti-derivative for $\displaystyle \int\frac{{2}}{{{4}+{100}{x}^{{2}}}}{\left.{d}{x}\right.}$= Preview Question 6 Part 1 of 2  

Evaluate the definite integral $\displaystyle {\int_{{\text{-1/5}}}^{{\text{1/5}}}}\frac{{2}}{{{4}+{100}{x}^{{2}}}}{\left.{d}{x}\right.}$= Preview Question 6 Part 2 of 2